Only thing I could not find yet is a way to start the bode-measurement with an SCPI command. Am I missing something?
We seem to have missed this one — thanks for pointing it out! As the
Bode Plot section of the Magnova SCPI manual shows, this functionality is not covered yet. We will schedule it for implementation in the coming weeks.
SCPI commands for configuring the save options or simply one that executes a quicksave would also be very nice to have.
We will discuss, how we can make the Save/Load functionality accessible through SCPI commands. A currently available way to achieve automated quicksaves "in the process" is by using mask test pass/fail actions - perhaps this could already suit your scenario?
Do we have an easy way to measure THD yet? Or is this a feature request? 
THD as measurement option would definitely be welcomed, I think that is a great idea.
Thanks again for the suggestion. We actually already have this feature on our list and plan to work on it - although there are other features that will take priority over the next few weeks.
I hope that Andre77 might be able to give us a hint on how to start the Bode measurement over SCPI
Andre77 is on well-deserved vacation for the rest of the week, but he sends his best regards.

Best regards,
Florian
Batronix