[rdonj]

I don't know, battle summoning could be a bit too good due to assassination battles (as you already pointed out). There really don't seem to be very many good ways to kill slann off, plus again if you have a lot of slann in a province your enemy has to kill several dozen temple guard every battle to get to them.

I don't know, trying to do anything too fancy may just turn out to be too unfeasible for game purposes. Auto summons do tend to be hard to balance in mods.