I think the point about CTR is very important, and should be weighed carefully before making binding decisions regarding back-ports. If a developer wants to spend time back-porting features, then I don't want to be the one to dissuade them. Like I've heard on this list many times, "patches welcome!"
CTR would, on the face of things, allow developers to back-port features as they feel is appropriate. Then, if another developer has concerns with the feature, the back-port, the implementation, or anything else, he/she would be encouraged to start a vote on it. It might be a nice courtesy to other developers if the intent to back-port was stated up front, but I don't expect it to be strictly necessary. I don't know if there are implied time-limits on reversion votes for CTR, but that can be addressed in by-laws when the community gets around to it.
