I second the idea that condition effects should offer more than just mostly an inability to act. Not a fan of all the ideas, but some, like stun increasing AP cost.
I'm also ExTREMELY against this "one-action-counter-everything-I-win"-button suggestion. Bless is already bad enough in that regard as it is.
The idea of dropping petrified/frozen characters causing additional damage to target and surrondings on the other hand sounds great!