and maybe: allow us to get more than 1 single source from corpses/enemies at a time :^/
also its VERY annoying that i can seemingly only use source vampirism on a few specific enemies AND i need those enemies to not have magic armor(read: if u run on a party that deals mainly physical dmg, u'll rely on consuming corpses :^/)
...doesnt help that in the late game nearly every enemy seems to have source vampirism, and player characters tend to have WAYYY less magic armor compared to enemy NPCs(and unless u have like 35+ wits, they'll get 1st move, wiping ur magic armor), so they'll constantly be stealing ur precious source
anyways, the way source points are so rare(especially before act 2) gives source skills a very bad "too good to use" problem, and in many cases, a "not worth using" issue cause many source skills can be VERY lackluster compared to others with equal/similar cost
Not only that, but some enemies actually require you to use Source Vamp to be killed. Like the Big guys in Kemms Vault and the little puppets during the Trial at the end. It resisting magic armour is...meh.