I've ridden a lot of street and track for quite awhile. But I would still say I'm not completely comfortable with my bikes. Even just standing still, I'm concerned about losing them on a wet patch, not having the sidestand fold up coming off a rear stand, etc.
There was a video of a German riding instructor I saw some time ago, where he rides up on a BMW something (not an S1000RR), hops off the bike as it rolls to a stop, balances it by grasping the mirror with one hand, and then casually walks around the balanced bike, pointing out minor details of a pre-ride inspection. Then he climbs back on the bike (from the right side), shifts into first, does a neat 180 doughnut, and rides back out of the shot.
It's not any of the particular actions/stunts that he does that are impressive - it's the level of comfort and confidence with the bike in all positions and orientations. It shows mastery, and I want it. I used to ride up and down all the exterior staircases at my college, but that's as far as I ever got - and I was still uncomfortable doing little rear-wheel slides into parking spaces and the like. Need practice.
But I want it without smashing up my nice new K1300S.
That's always been my reason for not pursuing this kind of experimentation; I hate crashed, rashed up bikes. So I want to get something I can beat the crap out of while practicing.
The stunters all seem to use 600SS bikes, which seem to me to be a horrible choice - they have expensive plastics and parts. I would think that a dirt bike would be better, but I need something that can be registered for the street. Would a dual-sport absorb more drops/low-speed crashes better, or something like a DRZ-400SM or the Yamaha 250 super-moto? Are there specific bikes that "crash well", without breaking ignition/battery parts or engine case covers?