I could be wrong, but don' t feel it would be a good idea to leave the brake system under any sort of unnecessary stress. As with any type of hydraulic system, the weak link will be the rubber hoses/lines. While they can handle the added pressure during use, they aren' t really designed for constant pressure. Rubber stretches over time, and I would think leaving the system under a constant strain would possibly cause pre-mature failure. I really don' t think you' d want to discover this failure, if you' re traveling at a high-rate of speed, and have to stop suddenly.
I would suggest a disc lock. I' m not sure what you had planned to use to strap your brake lever, but it would surely take a lot longer to get through that big hunk of metal locked around the rotor.
I'm worried I'd forget the disc lock being on and cause some damage.
I bought a disc lock from the 7th circle of Hell, you know....Wal-Mart, and it comes with a red cable that you hook the lock on to before locking it on the rotor, then you stretch the other end up to you hand grip. It' s a bright red sleeved cable. Little chance you' ll over-look it and try to drive off. Also being you keep your Busa in a shed, I don' t see you trying to take off on one wheel from it' s stored state. You' ll notice the disc lock with ease man.
I know thieves come prepared and if someone REALLY wants the bike, they'll get it.
While my bike is currently in a friend' s shed, I normally keep my bike in my kitchen. Hey, I' m a single guy, I can do that!
I have a German Shepherd, and 52 reasons (rounds that will go through a windshield and up to 12" into a human body) that increase my odds of keeping my Busa where she belongs!
I need to collect a few more reasons though. That' s just for my 9mm. Need some good rounds for the .40!