Never seen this asked so here goes:
Does it cause any problems if I change the SPD steps back and forth from 32 to 128 while the engine is moving?
I've done it a few times and the only thing I've noticed is that going from 128 to 32, when I scroll the thumbwheel down the engines speed picks up, not as soon as I change the setting. But I don't know if it'll cause any "permanent" damage.
While I'm on it, how about changing the MOM settings, while the engine is moving?