space bar reallocation

Thanks for responding to all my posts.  Another suggestion I have is to add the ability to reallocate the space bar when playing on a computer.  Right now, it does a ton of things depending on what's around.  The problem is it also casts the "s" button spell, so every time I try to open a chest, I cast a spell also.  I deal with this by selecting a spell that requires a target (so I don't waste spell points), but it still slows down the action.