Using Active Effects and Twodsix
Twodsix now includes the ability to add active effects either directly to Travellers or attached to items/traits. These effect convey bonuses and penalties to an actors stats. Most of the stats can be changed with an active effect - including skills. For more on how active effects work in Foundry, see this page https://foundryvtt.com/article/active-effects/.
There is a new tab on the actor's sheet that shows which effects (both active and inactive) are attached. Also, at the bottom of most items there are buttons to create, edit and delete active effects on items. Note that if you edit an active effect on an item attached to an actor, it will also modify the effect on the actor.
All editing of effects uses the standard FVTT dialog for Active Effects.
Note that you can stack multiple effects on an actor and attribute. However as the order of calculation is set by FVTT, you may get unexpected results if you mix override and add effects.
Most data (the "Attribute Key") that you will want to change begins with "system." To change the strength value for an actor, the attribute key would be "system.characteristics.strength.value". To change a skill, use the "Simplified Skill Name" that appears on the skill sheet. For example, "Gun Combat" would have a key of "system.skills.GunCombat". Note that ".value" is not needed in this case as you are modifying a proxy for the skill, not the skill directly. Below is an image of some possible effect changes.
