Sure, just where to find that command..
Down in Menu/cfg/Ordersbar.cfg it reads:
Button10Command=Dive
Button10IconRowColumn=1,10
Button10Tooltip=Auf maximale Tiefe gehen
So that is the dive command - I believe it to be part of FOTRS.
But where does it say what the dive command actually does?
Or what predefined command should I put there to just go to MTD?