can use the rear to tighten your line mid to exit, also in the braking zone its like throwing out an anchor... (dirtbike skills 101) I use it every now and then on the r6, on Stu's R6 i used it alot (mostly to bring the front end back down). Believe it or not they say clutch control is what you need to back it in. Rear brake is just to stop the rear from overtaking the front wheel and the clutch controls how far sideways you want it. I do NOT think you want to lock the rear tho on a road bike hahahahha Flat spotted tyres, bad vibes and lots of run wides i reckon if you do that