RE: Snap rolls with gyros?
For the most part, the instructors that post here generally agree that removing or disabling the AFS on the Hobbico Nexstar, but it seems that maybe Hobbico followed the "complaints" and removed it from the Nexstar. I don't see it as an "option" nor a "feature" on the Nexstar any longer. There was a reason for that, and it's the same reason we do not recommend using a gyro on a trainer or a plane that a beginner may construct or fly. Even those more experienced pretty much overwhelmingly reject the use of gyros on a fixed wing RC aircraft.
They are more suited to helicopters and that's probably where they belong.
And as stated earlier, this is, after all, a Beginners forum.
CGr.