use many ingredients/potions instantly
ability to take a batch of similar ingredients/potions and use them all at once, by dropping the ingredients on the character portrait in menumode.
make a limit, if it cause engine strain, limit the amount of items that can be used instantly, say 50.
Would also ameliorate the problem of accidental waste; e.g. I accidentally blew 10 Restore Health potions the other day by dropping the stack instead of just one. Some of it would still be waste (i.e. up to the maximum health), but that's better than it all being waste.