instead replace your stock oil cooler with a Jagg 10 row fan-assisted oil cooler. that would be money better spent IMO compared to another quart of oil in your system. I haven't seen any technical data that shows that an added quart of oil will cool anything down any better than 4 qts will. There's tons of data on oil coolers though.
I guess, it depends on if the sump does a lot better job at keeping the oil pickup submerged and not cavitating with the high g-load acceleration you will be experiencing.
The extra oil wont hurt but Id be more worried about the oil cooler if you don't have one. I am using the stock pan and hd oil cooler on both my 120r and my 124.