Unfortunately, as far as we've been able to tell, Talents (and those Traits that rise through dialogue) are hard-coded into the game; we're not able to change how they work or add our own.
I might do a Skill overhaul of some sort, though there are limits to what I can (and will) do. The mod should as a whole make things more difficult for the player, or at the very least benefit the enemies more than the players. I'll probably add my AoE Healing Rain skill in as an additional high level healing spell that has the drawback of affecting enemies as well. Fire rain can be made available to the player too.
