parking brakes? plane still moves?

[SWAFO]

I agree with John on this issue. If scaling the thrust down (ONLY if it's an unrealistically high value) doesn't work, then increasing the
strength of the parking brake should stop all movement.

You speak of ground friction being the problem. How could this be? I thought it was essentially the same for different surfaces
EVERYWHERE in the FS universe, and doesn't really change via the AFCAD file, etc. Not too sure though.