Other than a patient and controlled right hand, I know of nothing that will safely limit the power of the bike. In all reality, the S2R doesn't have what I would consider an extreme amount of power. It comes on higher up in the rev band, and the midrange torque is quite flat, so it's very easy to control. The fact that you're concerned about too much power means you should be dilligent enough to show some self control. Take the MSF course, get an S2R (or 695) and prepare to have some fun.