Problem with using pedals and such, you can still vary the RPM ever so slightly, by a nervous twitch or something, and thus creates a loop, and make the sounds awful.
Ive tried the Max Idle setting in Tweak, and it works fairly well! only problem is it cant seem to hold the RPM Value above 6000rpm, Example, if i set it to 800 (8000rpm) it starts at 8000rpm but drops to 6000rpm, regardless how high the value is above 600