Thought I would post 2 suggestions that I would love to see in the UI.
1. Multiple selections on spell targets - Its quite annoying when your trying to buff all the units in a group with buffs that you have to cast the buff each time on each unit. Why not allow the person to use shift or alt to highlight multiple targets.
2. A favorites bar - It would be nice to be able to drag 8 frequently casted spells to a favorites bar that I can click on instead of going into the spell book each and every time.