Yeah, I always find it strange when people post a proposal thread for a new in-character element. I think the "Proposal:" threads are supposed to be for mechanical/rules changes, or actual amendments to the charter and things.
That's the main reason I treat "Proposal:" threads as super-important global changes. If it said "Idea:" or something, I wouldn't. But I like being able to go down the list of threads, see which are full proposals from the title, and be able to check off which have passed, failed and are still under discussion. Seeing a thread marked "Proposal:" which is being used for general discussion or just noodling around makes me edgy.