The comments about the light source:
I could certainly tell it was a specific decision by the Arcen to make light sources a tactic choice - Use light enchants or cast spells.
What I'm saying it's that it's a bogus choice. "Well, you can either see what you're doing or be forced to constantly cast light spells." That's a pretty weak in my opinion.
That's way I made my suggestion. Not because I couldn't grasp the designer's concept
Here's a suggestion that is a "real" choice - Passive spells. I think it would be pretty sweet if certain spells, like light, are made into passive spells that can be switched on or off. If you chose to enable light, a small amount of your mana is made unavailable until you disable it again.
This opens up possibility for other neat spells like defense, group buffs, etc.
Just a thought.