No way to add talents currently as far as I know, but hopefully will be on release. Maybe I'll do something for CC like when resisted, it still applies a weaker variant of the CC (like how I have Staggered and Off Balance, which reduces AP by 1). So there's still be some benefit to the CC even when resisted.

I definitely want to be able to display the formula calculation in the combat log, but not entirely sure how to do that yet. I think it's possible even without the editor.