They don't need to rotate in order to be playable, it's really a matter of personal preference.
The reason they are sticking is that the factory in Malaysia hot glues them in place. You can usually get them off by twisting or, if they're really stuck, by running them under hot water and/or soaking them for a bit. Helps to soak them in hot water and soap anyway, as the FOW models have been drenched in mold release agent in recent years, which doesn't take too well to paint.
-Doc