Tnx for repy Kai.
I think that the PowerMate gives me exactly what i want, rotation (i.e. VFO) and button-press (to select step-size or other things).
It is not very practical or convenient to tune in HF-transmissions with a mouse, or a keyboard.
For that purpose, it is much more handy to use a VFO-knob, and I miss it alot.
I know there is the E-coder, that gives me what I am looking for, plus extra buttons, but to a price that is standing out.
And since i have the PowerMate, and it is sturdy and solid, and still working, I thought that it might work.
Maybe someone with skills could put together some code, that reads the PowerMate and sends it into ExpertSDR, to do VFO-tuning the same way as the E-coder can do.
73 de SM2SXA