You don't want to be flatshifting in the FZR. You'll be in the red in 26 seconds let alone 26 laps . . . . Plus for quick changes in the higher powered cars (especially if your cheatin' and using the flappy paddle gearbox) you need close knit ratios as well . . . . I don't know about the S/S's but for the GT's you deffinatly want to perfect your clutching if you want any hope of preserving your clutch for any distances.
I was using the sequential shifter instead of the H-gate, though, but I don't think that would make a difference in whether or not the cluth overheats when flatshifting. I'll try flatshifting with the H-gate tomorrow and see how that goes.