And no, they shouldn't add a block, as the BUD isn't only a switch. Heres a vid that explains the fully potential of BUDs and why they should stay(in their current form, not as an block): http://www.youtube.com/watch?v=QYe_xe7SNKY
I think this orginaly was so baby animals wouldn't wander of from their parents, as they don't fit in smaller spaces.
I did, I guess I started on this bugreport befor they added the other one.