diff --git a/regamedll/common/const.h b/regamedll/common/const.h
index 024a2a3d5..f6ec01c48 100644
--- a/regamedll/common/const.h
+++ b/regamedll/common/const.h
@@ -158,6 +158,11 @@
 #define EF_FORCEVISIBILITY          BIT(11) // force visibility
 #define EF_OWNER_VISIBILITY         BIT(12) // visibility for owner
 #define EF_OWNER_NO_VISIBILITY      BIT(13) // no visibility for owner
+#define EF_NOSLERP					BIT(14) // no slerp flag for this entity (addtofullpack)
+#define EF_FOLLOWKEEPRENDER			BIT(15) // the entity following will not copy the render (like it follows nothing)
+
+// Custom flags that aren't handled by the client
+#define EF_CUSTOM_BITS (EF_FORCEVISIBILITY | EF_OWNER_VISIBILITY | EF_OWNER_NO_VISIBILITY | EF_NOSLERP | EF_FOLLOWKEEPRENDER)
 
 // state->eflags values
 #define EFLAG_SLERP                 1   // do studio interpolation of this entity
diff --git a/regamedll/dlls/client.cpp b/regamedll/dlls/client.cpp
index 4d42cbe34..2a58443d7 100644
--- a/regamedll/dlls/client.cpp
+++ b/regamedll/dlls/client.cpp
@@ -249,7 +249,7 @@ void WriteSigonMessages()
 
 #ifdef PLAY_GAMEDLL
 		// TODO: fix test demo
-		iFlags &= ~ITEM_FLAG_NOFIREUNDERWATER;
+		iFlags &= ~ITEM_FLAG_CUSTOM;
 #endif
 
 		MESSAGE_BEGIN(MSG_INIT, gmsgWeaponList);
@@ -4479,7 +4479,7 @@ BOOL EXT_FUNC AddToFullPack(struct entity_state_s *state, int e, edict_t *ent, e
 
 #ifdef REGAMEDLL_ADD
 	// don't send unhandled custom bits to client
-	state->effects &= ~(EF_FORCEVISIBILITY | EF_OWNER_VISIBILITY | EF_OWNER_NO_VISIBILITY);
+	state->effects &= ~EF_CUSTOM_BITS;
 
 	if  (ent->v.skin == CONTENTS_LADDER &&
 		(host->v.iuser3 & PLAYER_PREVENT_CLIMB) == PLAYER_PREVENT_CLIMB) {
@@ -4487,7 +4487,13 @@ BOOL EXT_FUNC AddToFullPack(struct entity_state_s *state, int e, edict_t *ent, e
 	}
 #endif
 
-	if (!player && ent->v.animtime && !ent->v.velocity.x && !ent->v.velocity.y && !ent->v.velocity.z)
+	// add studio interpolation if non-player entity is moving (why?)
+	if (!player &&
+#ifdef REGAMEDLL_ADD
+		// adds slerp (studio interpolation) if not set
+		!(ent->v.effects & EF_NOSLERP) &&
+#endif
+		ent->v.animtime && !ent->v.velocity.x && !ent->v.velocity.y && !ent->v.velocity.z)
 		state->eflags |= EFLAG_SLERP;
 
 	state->scale = ent->v.scale;
@@ -4513,8 +4519,22 @@ BOOL EXT_FUNC AddToFullPack(struct entity_state_s *state, int e, edict_t *ent, e
 
 	state->aiment = 0;
 
+	// following something
 	if (ent->v.aiment)
-		state->aiment = ENTINDEX(ent->v.aiment);
+	{
+#ifdef REGAMEDLL_ADD
+		// if set, it will still follow the player with a bit of "delay", still looks fine (experimental)
+		if (ent->v.effects & EF_FOLLOWKEEPRENDER)
+		{
+			// will keep the current render entity values if it's set
+			state->movetype = MOVETYPE_NONE;
+		}
+		else
+#endif
+		{
+			state->aiment = ENTINDEX(ent->v.aiment);
+		}
+	}
 
 	state->owner = 0;
 	if (ent->v.owner)
diff --git a/regamedll/dlls/player.cpp b/regamedll/dlls/player.cpp
index fd8b507ea..d12768c16 100644
--- a/regamedll/dlls/player.cpp
+++ b/regamedll/dlls/player.cpp
@@ -1303,26 +1303,52 @@ CWeaponBox *EXT_FUNC __API_HOOK(CreateWeaponBox)(CBasePlayerItem *pItem, CBasePl
 		pWeaponBox->pev->nextthink = gpGlobals->time + lifeTime;
 		pWeaponBox->PackWeapon(pItem); // now pack all of the items in the lists
 
-		// pack the ammo
-		bool exhaustibleAmmo = (pItem->iFlags() & ITEM_FLAG_EXHAUSTIBLE) == ITEM_FLAG_EXHAUSTIBLE;
-		if ((exhaustibleAmmo || packAmmo) && pPlayerOwner)
+		// player is the ammo source
+		if (pPlayerOwner)
 		{
-#ifndef REGAMEDLL_ADD
-			pWeaponBox->PackAmmo(MAKE_STRING(pItem->pszAmmo1()), pPlayerOwner->m_rgAmmo[pItem->PrimaryAmmoIndex()]);
-#else
-			pWeaponBox->GiveAmmo(pPlayerOwner->m_rgAmmo[pItem->PrimaryAmmoIndex()], (char *)pItem->pszAmmo1(), pItem->iMaxAmmo1());
-#endif
-#ifndef REGAMEDLL_FIXES
 			// by removing ammo ONLY on exhaustible weapons (slot 4 and 5)
 			// you are allowing to duplicate ammo whenever:
 			// (1) you have 2 weapons sharing the same ammo type (e.g. mp5navy and glock)
 			// (2) you are dropping a weapon alive and pickup another (with same ammo type) without ammo
 			// and, logically, you throw your ammo with your gun with packing enabled
-			if (exhaustibleAmmo)
+			bool exhaustibleAmmo = (pItem->iFlags() & ITEM_FLAG_EXHAUSTIBLE) == ITEM_FLAG_EXHAUSTIBLE;
+
+			// pack the primary ammo
+			if (exhaustibleAmmo || packAmmo)
+			{
+#ifndef REGAMEDLL_ADD
+				pWeaponBox->PackAmmo(MAKE_STRING(pItem->pszAmmo1()), pPlayerOwner->m_rgAmmo[pItem->PrimaryAmmoIndex()]);
+#else
+				pWeaponBox->GiveAmmo(pPlayerOwner->m_rgAmmo[pItem->PrimaryAmmoIndex()], (char *)pItem->pszAmmo1(), pItem->iMaxAmmo1());
+#endif
+
+#ifndef REGAMEDLL_FIXES
+				if (exhaustibleAmmo)
 #endif
+				{
+					pPlayerOwner->m_rgAmmo[pItem->PrimaryAmmoIndex()] = 0;
+				}
+			}
+
+			// (3rd party support) now that reapi can register custom ammo
+#ifdef REGAMEDLL_ADD
+			// use this flag if you don't want the player harvesting this kind of ammo from dropped weapons
+			bool exhaustSecondaryAmmo = (pItem->iFlags() & ITEM_FLAG_EXHAUST_SECONDARYAMMO) == ITEM_FLAG_EXHAUST_SECONDARYAMMO;
+			int iSecondaryAmmoIndex = pItem->SecondaryAmmoIndex();
+
+			// pack secondary ammo now (must be valid too)
+			if ((exhaustibleAmmo || exhaustSecondaryAmmo || packAmmo) && iSecondaryAmmoIndex != -1)
 			{
-				pPlayerOwner->m_rgAmmo[pItem->PrimaryAmmoIndex()] = 0;
+				pWeaponBox->GiveAmmo(pPlayerOwner->m_rgAmmo[iSecondaryAmmoIndex], (char *)pItem->pszAmmo2(), pItem->iMaxAmmo2());
+
+#ifndef REGAMEDLL_FIXES
+				if (exhaustibleAmmo)
+#endif
+				{
+					pPlayerOwner->m_rgAmmo[iSecondaryAmmoIndex] = 0;
+				}
 			}
+#endif
 		}
 
 		pWeaponBox->SetModel(modelName);
diff --git a/regamedll/dlls/weapons.cpp b/regamedll/dlls/weapons.cpp
index 811b901cd..acb3936cf 100644
--- a/regamedll/dlls/weapons.cpp
+++ b/regamedll/dlls/weapons.cpp
@@ -1259,9 +1259,19 @@ int CBasePlayerWeapon::AddToPlayer(CBasePlayer *pPlayer)
 	if (!m_iPrimaryAmmoType)
 	{
 		m_iPrimaryAmmoType = pPlayer->GetAmmoIndex(pszAmmo1());
+#ifndef REGAMEDLL_FIXES
 		m_iSecondaryAmmoType = pPlayer->GetAmmoIndex(pszAmmo2());
+#endif
 	}
 
+#ifdef REGAMEDLL_FIXES
+	// (3rd party support) if someone updates (or screws) the secondary ammo type later
+	if (!m_iSecondaryAmmoType)
+	{
+		m_iSecondaryAmmoType = pPlayer->GetAmmoIndex(pszAmmo2());
+	}
+#endif
+
 	if (AddWeapon())
 	{
 		return CBasePlayerItem::AddToPlayer(pPlayer);
@@ -1587,7 +1597,11 @@ int CBasePlayerWeapon::PrimaryAmmoIndex()
 
 int CBasePlayerWeapon::SecondaryAmmoIndex()
 {
+#ifdef REGAMEDLL_ADD
+	return m_iSecondaryAmmoType;
+#else
 	return -1;
+#endif
 }
 
 void CBasePlayerWeapon::Holster(int skiplocal)
diff --git a/regamedll/dlls/weapons.h b/regamedll/dlls/weapons.h
index 431284fb9..82e1356d2 100644
--- a/regamedll/dlls/weapons.h
+++ b/regamedll/dlls/weapons.h
@@ -35,12 +35,16 @@ const float MAX_DIST_RELOAD_SOUND = 512.0f;
 
 #define MAX_WEAPONS                 32
 
-#define ITEM_FLAG_SELECTONEMPTY     BIT(0)
-#define ITEM_FLAG_NOAUTORELOAD      BIT(1)
-#define ITEM_FLAG_NOAUTOSWITCHEMPTY BIT(2)
-#define ITEM_FLAG_LIMITINWORLD      BIT(3)
-#define ITEM_FLAG_EXHAUSTIBLE       BIT(4) // A player can totally exhaust their ammo supply and lose this weapon
-#define ITEM_FLAG_NOFIREUNDERWATER  BIT(5)
+#define ITEM_FLAG_SELECTONEMPTY     		BIT(0)
+#define ITEM_FLAG_NOAUTORELOAD      		BIT(1)
+#define ITEM_FLAG_NOAUTOSWITCHEMPTY 		BIT(2)
+#define ITEM_FLAG_LIMITINWORLD      		BIT(3)
+#define ITEM_FLAG_EXHAUSTIBLE       		BIT(4) // A player can totally exhaust their ammo supply and lose this weapon
+#define ITEM_FLAG_NOFIREUNDERWATER  		BIT(5)
+#define ITEM_FLAG_EXHAUST_SECONDARYAMMO		BIT(6) // A player will exhaust weapon's secondary ammo supply if dropped (ITEM_FLAG_EXHAUSTIBLE does both)
+
+// if someone has an idea for another flag pack it here, so client prediction will not be screwed (or something) if PLAY_GAMEDLL is defined
+#define ITEM_FLAG_CUSTOM	(ITEM_FLAG_NOFIREUNDERWATER | ITEM_FLAG_EXHAUST_SECONDARYAMMO)
 
 #define WEAPON_IS_ONTARGET          0x40