One thing I noticed while playing Oak was that if you're clicking to open your kill tree and your hand slips you might start planting a raise dead ward... while your skill tree is open.

I've also found that targetting Oak's hit + vulnerability ability to be kind of a pain on demigods, especially at close range - is there a minimum range to it? It might be nicer if it targeted as generously as his shield, which I've found to be very easy to apply to yourself in the middle of a desperate fight. (Is there a hotkey for this?)

Being able to see an enemy's HP represented as numbers - at least if you mouse over them - would also be very useful, that and being able to see your own MP count.

Also, selecting a new demigod should probably reset the scroll bar on their details to the top. It's irritating to open a new demigod's life story on the fourth page.

EDIT: Oh, and being able to see where on the map your camera is pointed would be nice.