Specify number of items when using blacklist

[scifibob]

When using blacklist on multiple output machines (using variables), the manager is filling the first machine, then the second, etc. It doesn't matter if I select run shared command or run once per inventory.

What I would like was a kind of load balancing, being able to push one (or as many as I specify) item at a time into each machine, even if I don't specify what item to move.
Just to clarify that, It's because I have multiple chests with multiple AE2 crafting interfaces, and it would be a pain to specify all the ingredients of the crafting in item move operations.

As it is now, there is no gain whatsoever from using SFM over for example EnderIO cables with filters.
Well, is't the thing that SFM can access multiple sides of a machine, and that's the only reason I'd like to use it.