O.k. I agree with no-mouse direction. I haven't talked to George about the potion inventory system yet but I believe that he would also be against using the mouse.

But I'm not sure if we should limit the inventory to three potions, maybe we should consider something similar to Star Wars Jedi Academy:
http://www.filefront.com/17348410/StarWarsJediAcademy_ForceInventory.wmv

Your idea about holding the potion key and switching potions with arrow keys is not bad but maybe we could make things even more simple. How about if pressing the potion key (let's say P) would switch/browse through the potion inventory but also display the potion information on the action panel. So you browse with P, but if you press A while holding P you use the potion.

Pressing P would have to override any action info on action panel (if any possible, near action is already being displayed) and, if not pressed (or if P & A are pressed and potion is used), everything should return to normal (possible, near action should continue to be displayed).

What do you think?