Yeah, it can be tough on some of the stock android software since development minded folks seldom want to mess with something that already has multiple fully fleshed out apps to replace it. I kinda like touch wiz once its dewizified but there is almost nothing out there that you can add on to it or use to modify it. I did think of one thing though, they added some new setting adjustments into the messaging app in CM7. You might want to consider grabbing that and seeing if it brings this to the table. I cant recall all the changes in it as I didn't use it. That would be kinda stock messaging.