Changing lenght of Instant Replay (10 replies)

Hi,
I have read various posts about this but the solutions are or confusing or not working.
I want to get a longer Instant Replay than the max. 1 minute, I mean the instant replay (pause + R during race) not the race replay. It's not in the F1grafics.cfg, AFAIK not in Magic Data or in the GP4Tweaker.

I have set Advanced grafics to manual and have run 'Test' again, but this will not yield a higher possible bar for the replay length in the in-game options. My max. slider gives me 1 minute and not more.
Any way to tweak this with/without external utility?

Thanks,
XenonS