[Illuminated One]

If your clam-carriers are in a province with a lab you just need to click on pool to get the gems. But maybe I'm misunderstanding you here.

Well, the only thing I'd like to see would be the ability to change the position of commanders in the unit queue. Just click on a commander portrait and shift-click on another and they change places.
Communions are such a cool feature, and the different behavior of slaves depending on casting order is nice, but it sucks that you can't control it.