This is how it was called at Midwest and Kettering District:
1. Must use tongs to pick up the moon rocks, empty cells, and super cells from the fueling station floor or airlock floor.
2. Can put rocks/cells into the fueling station and use your hands to push them out the airlock as long as you do not break the plane of the alliance wall with your hands. There is a Q & A about this clarifying the rule that you must use the tongs to pick up but not to push out. we use the roll out method at Midwest a lot!
3. Don't even think about touching the super cell until to 20 second sound is made. even if you do not put it on the crater you will get the double penalty.
4. You could not dump the bin into the fueling station. The bin must stay on the floor.
at both events, I specifically asked about the rolling on the floor to make sure the refs knew the Q & A. I will look it up and attach it here in a minute.
EDIT: Found it and it is really clear:
http://forums.usfirst.org/showthread.php?t=11987
Paul