While dropping the clutch at 6K RPMs certainly will require an aftermarket clutch, if you don't plan on doing those types of launches as you indicate, the RS4 clutch will be fine.
I have Stage 3 minus (GIAC), but have tracked the car extensively with no clutch issues. I don't do drop clutch launches, but I do heel-toe and rev match on all downshifts which helps clutch, transmission and gear synchros.
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2001 B5 S4: Upgraded to Stage 3 TRILLION
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The B5 platform... the car that saved Audi.
There's nothing else like a B5 S4 SURGE! Feel it baby!
Track list: Laguna Seca, Road America, Watkins Glen, Mid Ohio, Thunderhill, Sears Point, Mont Tremblant, Lime Rock, Grattan, Blackhawk Farms, Putnam Park