It would be nice if left-clicking your character's tile would default to 'wait a turn' when there isn't anything else to interact with there. It would also be nice if left-clicking friendly summoned monsters would default to displacing them (with, say, shift+click for the much rarer cases where you want to attack), since they often step in the way and block your pathing algorithm. Yes, these can both be done via simple keyboard commands, but it's a small nuisance when the interface is otherwise very mouse-friendly-and-focused.
