I believe we have all had that problem where we lay down a furnace, put in the iron and coal, and then someone comes up and takes it. I have, at least, some kid came up behind me, broke the furnace and ran away with my iron. So if it's possible, could there be something implemented, that when a furnace is put down no one can get into it, and when a player that is not the person tries to get into it they get this: This furnace is owned by player (name). I think I'd like CTF a lot better if this is implemented.
Edit: This idea is to prevent your TEAMMATES from taking your things. Not people from other teams.
If people don't have supreme and ultimate does not make them any less than what rank they are or if they are a citizen. By your statement, you are basically saying that more than half the meepcraft community are noobs.