That kind of power without modern nanny-tronics... yea that sounds super-sketchy... but it'll be fun until it's not. :-D
I am obviously in the minority here... There is not one thing about a 256 Hp motorcycle that sounds "fun" to me.
I share your standpoint, to some extent, and can validate the "nanny" comment.
I have a supercharged 1998 Saleen Mustang with a TON of work done to it. As it sits now, it is putting out in the neighborhood of 920rwhp (estimated 1,100hp, after drivetrain loss). This car started out as a 235hp V8, and the power increased as I went on through the build. I have not driven the car in quite some time, and am looking to dial it back some, as it is just too much power. It demands your fullest attention, and even still, I have had a few scary moments with the tires breaking loose when I was not expecting it, one time fishtailing at 70mph on the interstate. It's just too "white knuckle driving" to be enjoyable, now.
That said, 256hp would be peak, and a turbocharger would need to spool up in order to produce maximum output. As long as one were to keep the RPM's low, it would not produce anywhere near that sort of power. Problem is, an online four doesn't make a lot of power on the bottom end, and almost requires the rider to climb high on the tack, to get any real usable horsepower. Hence where the "nanny controls" come into play. I have to admit to being incredibly nervous when I rode my Aprilia RSV4 on a test ride. These kind of horsepower numbers were virtually unheard of, just a decade prior. Think about it. We have gone from 100hp+ being the benchmark in the early 2000's (without going to the liter bikes), to 220hp+ being produced from several big name manufacturers such as Ducati, Aprilia, Norton, and even Kawasaki and Yamaha, today. Tremendous fear factor involved. And yet, the bike was as tame as any bike I have ridden, on my first ride. As a matter of fact, in some ways, it is even more relaxing to ride than my Ducati 748s, which produce less than half the power. Reason being, when all of the computer-controlled advancements, the power of the Aprilia is so much more reliable and predictable than the Duc. When I get on one of my 748s, it is sort of a crapshoot... sometimes I snap the throttle open and bring the front wheel off the ground at 40mph or so, in a roll-on wheelie, and other times the bike feels incredibly underpowered (well, technically, torque.) My RSV4 is always consistent, partly because I am not coming anywhere near maximizing the bike's potential, and partly because of computerization. With all the power at tap, everything just feels more controllable. Yes, it is there when I want to shut it off and have a track day, and it is certainly a beast when I do, but even with them off (where I am in full control over everything), the horsepower has a lot more finesse and controllable consistency. It is sort of like having a bodybuilder lift 45lbs dumbbells, but having him take ten seconds to do one curl.... vs. having Clay Aikin do it. The bodybuilder is going to be much smoother and consistent, because he has more than enough power for the task. And while 200hp+ is definitely an intimidating thing from a sub-400lbs., two-wheeled motorcycle, it is actually quite pleasant to ride, once you get past the stigma.