Jeff wrote:
I really liked the Battle Copters zip cord flight feature. It sent the vehicle and figure way up into the air and still landed pretty softy.
I did catch my brother in the face once with it though.

Those were definitely cool. I wish I hadn't lost my launcher. Ace was a good mold, too. Gotta get another 'copter some day.
MBB, those light-up launchers made sense to me as a kid, too. All except Mutt's.
I know we're only talking about RAH Joes, but I have to mention the 60s Green Beret bazooka. It's one of the few accessories I have from my mom and uncle's '65 Joes and it still works. My uncle gave me some kind of plastic rods that are longer than it to shoot since the rockets were lost a long time ago and it will launch them across the room. I can only imagine how far it would shoot the original ammo. That thing is freaking awesome!
It's hard for me to choose just one RAH action thing, most of them were really neat, especially the ones in the 80s. I think my absolute favorite feature is the automatic landing gear on the Sky Striker, Night Raven, and Phantom. I remember the first time I got a Night Raven, thinking it was so cool to be able to actually deploy the landing gear instead of manually lowering it.