@dslyr this is one of the better forums I've found, especially for fixed wing. Everyone is just on edge due to draconian regulations threatening our entire hobby. No one wants to see fuel added to the fire. No harm meant.
I for one think a tp drop sounds like a blast.
I'd just use a servo mounted on the side with a rubber band to old the payload load on. I would think if the band were sort of pre stretched to one side it would impart enough spin to the roll to unravel during free fall...
Was looking for a picture, maybe I'll come up with it in a bit...