That's unfortunate. Hopefully Talents will be able to be changed in the future. I gave thoughts on them anyway, just in case.
As for spells, there are clearly some OP ones or ones that are just way too easy to use over others. Charm and invisibility can be. At one point I was wandering alone with my Wizard and accidentally stumbled upon a group of around 6-7 guys. I was high enough level to continuously use Invisibility, wait until it cooled down, use a spell, then use Invisibility in the same round to solo them. Without Lone Wolf.
Summons should be more for utility than damage, so adding spells to them while making them more elementy mixes it up. Giving EE defense, AE dodge, etc. or just utility spells. Lots of times they are summoned to buy time as well, especially early game. The other summons I've heard rumor of (scrolls only) should probably be added as skillbooks to certain classes. If you were daring, maybe even add custom spells for summons. IE. spider could summon spiderlings.
Healing Rain sounds fun against Zombies :x.
