I am glad to see threads like these! Excited for the mods.
I wonder if you can't leave talents be but just increase the requirements to select/equip them, even put them out of reach if they aren't balanced. I don't think I will ever use Glass Cannon personally.
The hottest mod will be the one that makes the game flatrate harder, rather than different, and then separately does something to address the "Easier over time" issue.
Big Debuffs to select abilities is always going to be subjective. I wonder if small debuffs to many abilities could be an answer. It certainly gives a lot more tools for fine-tuning at any rate. Debuffing abilities and leaving consumables the same may also necessitate Crafting, possibly creating more immersion.
Crap I am in a hard spot, do I have any scrolls or potions that might keep us all alive until next turn?
Buffs like "+50% damage" seem pret-ty frickin' obnoxious. Would rather see 35%, or 25% which is increased to 50% if below x% hp.
Healing Rain seems to be a cool idea, but if an AoE is too strong perhaps it could be a difficult-to-craft scroll only, we can't have people spamming something like that!
So many fun ideas. I need to learn how to mod myself! Big respect for those folks that put big hours into their mods.