Yes. GP4 must support analogue clutch what i need. I tried if i assign buttons to Acc./Brake and use my brake pedal as analogue clutch, it works. It required calibration and now i have on/off acceleration, but at least i can play with the clutch(break pedal) and i really can start gently and go slowly in the pits.
But what if i would have a second pedal set? Could i use analogue acc/brake and analogue clutch at the same time?