Pe:
I know in theory that a two stroke won't have the engine braking of a 4-stroke, but in the real world of model planes the two stroke (if operating properly) will come down to low idle very quickly when you chop the throttle. They also spool up quickly if you use a light weight prop. Two stroke engines that don't decelerate quickly usually have an air leak (bad bearing seal typical).

In MotoGP, they've figured out a way to eliminate engine braking in a 4-stroke. The engine management computer turns up the idle speed so it thinks it's a two stroke...