I still don't quite see what you're getting at I'm afraid...
1. If Admin, Mods or SM's come up with a (possibly) good idea, chances are someone will create a topic in Chit Chat to discuss it and get feedback from the main forum. Everyone would therefore get their say.
2. Why does what have to be posted in SM chat? My comment pointed at the fact that the For Sale topics were discussed in the main forum and demonstrates perfectly why this discussion is meaningless. If anyone has a good idea they just need to make a topic for discussion and away you go, never needs to go anywhere near SM Chat.
If the split of the For Sale stuff had been suggested in SM Chat, chances are it would've been approved in there and then someone (probably Tom/Danny) would've started a topic in Chit Chat to discuss suggestions. So it would still be win-win.