I'd say, kill the now outdated CNJ storyline, drop aero and stone from cnj's spell list, and give us banish/banishga and scourage/scourga or some sort. You THMs can have the rest.

Only problem is that by doing that, we break the number of abilities/spells each class has... so instead of adding new stuff to THM, every other class would get something new and THM would get left overs, to maintain number of ability balance.
But as a CNJ, I'm willing to make that snack-arfice.