The busa is low, so it is quite easy to get your pegs to scrape. Like it was said above, if you plan on knee dragging remove the peg feelers. At extreme lean you can scrape the exhaust and side covers.
Where the story of "Busas can't corner", comes from is the tendency of the busa to push hard upright when you use the throttle wrong in the curves. Due to it's torque even at low rpm, you have to apply less power coming out of a turn, than you would on a 1000cc. On the smaller bikes you can start powering up before the apex, and go full power after the apex. You can do this on the busa as well, but it will understeer. This is what give riders, that are unfamiliar with the busa, the feeling it can't corner.
Road riding is different from the track in one primary aspect: Generally you can not see through the turn, due to obstacles. Therefore cornering is always wide in, and late apex when you can see the exit. This works well for the busa - you can use the torque to power out of the exit very quickly. Many inexperienced riders think they can ride the road like the track. It does not work, and they will end up in the bushes on the first decreasing radius corner. Apex too early, and you have no lean left to complete the turn, and you will already be on the throttle. Add a throttle chop to too much lean, and you end up with a low side slide. Watch the dragon crash videos on youtube.