Many people complain about Mages requiring more micro than other classes (and not even shining in the DPS department either).
Can you at least make it so I can prepare the next spell to cast while my mage is on cooldown (greyed out)?
A second idea is to make the magic a separate button (so the mage can hold anything in his two hands) (maybe on or next to the mage's portrait) so they can even attack unarmed like everyone else.