Jedi may be cheese, but it's not prequel level Limburger. ;)

One could argue the traps had been laid for a while. The Ewoks could have other enemies, and the tv movies bear that out. They lacked the nerve to fully engage the Imperials until they met Luke and the gang, and Threepio told them the big picture.

As I've said before, there is enough visual evidence around to suggest the Ewoks killing troopers and using their blasters was toned down in the editing room. If we're lucky, maybe we'll get some footage of Ewok violence in the digital version of the Rinzler book.

All things considered, I have bigger issues with where the heck the AT-AT's were during the battle. Was there only one on the entire moon?