They'll climb all over the aircraft if you let 'em. I've had 'em on the roof in a Turbine Beaver. You just don't know where they are.
Tail feathers are big no-no's though. Crazy they may be but most realize that that kind of thing is going to end in tears!
Tailstrikes are not totally unknown particularly on King Airs and I believe the Bandit has had a few too.
As for the packing of canopies in the aircraft....not when I'm sitting up front, thats a promise.
Most skydivers I've had the pleasure of flying for have prefered me to wear the 'chute, so I do. If thats the only chance of survival, I want it on my back!