I've had a student do the wrong pedal on me on entry to auto in a 22, and it was extremely unnerving. Horn sounded and RPM dropped like a stone but I don't remember any roll. Recovery action (which came embarassingly late) was to stick the proper pedal in.
As part of the FI course you're taught to guard the stick and brace the pedal to protect against wrong inputs, but I guess after a few years I'd gotten a bit casual about it. If I remember there's a safety notice about it too.
However I have seen the EC120 demonstrate the opposite roll in response to pedal input under autorotation so it is possible.