Do you mean moving solids?
Moving solids are impossible, due to TPT would have to be rewritten (I believe in a new code), plus a new database. Not going to happen, anytime soon. About the rope/stick thing, I don't know, but it's best for dev/moderator to answer that.
by the rope/stick thing im talking about something like the joint in the online powder game or whatever its called http://dan-ball.jp/javagame/dust2/
edit: i think moving solids might be possible by just connecting particles together. They might not be able to roll very well if at all but someone (definitely not me) might be able to code somethig like that or maybe fix the ball in jacob's mod