Well, the only thing I really want to see from Mages, is an option to choose "Glass cannon" development path I.e., further severing the weakness of the class (endurance, strenght, agility, etc.) for the additional boost in spell power (not just damage) and/or something else.
For example, unlike many players that prefer multi-classing, in first NWN at, say 30 level cap, I was really annoyed at the fact that going a pure wizard was totally useless on some settings, compared to 29 wizard/1 rogue, for the double boost in some important abilities. Pure/true mage/wizard is one of my favourite classes in most CRPG.
The gameplay of such character tends to be hard even on mid-levels, but closer to the end you start to fully enjoy yourself. At same time, since you're went full-magic, you can never drop your guard - a single or a pair of arrows can easily end your life, if unprepared.
