If you had access to a Trackman during bullpens, you could learn fast enough how to adjust your grip/release to raise/lower your spin rate. Kyle needs to pony up $40k for one of these.
I have one.
To answer a few questions posed in this thread:
Yes, the faster the ball is thrown, the higher the spin. In our tests, spin rate is directly correlated with velocity BUT the coefficient seems to be static for a pitcher. In other words, spin rate is innate in some way. If you throw a 70 MPH fastball your spin rate will be proportionally the same as your 92 MPH fastball. Trevor Bauer was the first to posit this theory and after extensive data collection it seems to hold up.
That being said, hitters probably adjust to this. It is not your gross spin rate specifically but rather the difference in your spin rate vs. the league average for your size, build, etc. How hitters perceive pitches is still rather unknown, so more research needs to be done.
For spin rate on breaking balls... well, this is a very complicated subject. More is not necessarily better. Applicable/useful spin is important. Imagine a slider that spins 3000 RPM (high) but it is all gyroscopic in nature. In theory none of this spin affects the movement of the pitch (a true high spin gyroball) and the pitch "hangs." This is the mythical (0,0) pitch that PITCHf/x is calibrated to, a pitch with no magnus effect due to spin.
Dr. Alan Nathan writes the most on this subject. I suggest reading this.
http://www.baseballprospectus.....php?articleid=25915
The answer, like most in baseball, is that "it depends." Most theories out there on how spin rates are useful or how they should effect pitching are just that - theories. Untested, unproven. It will take many months and years of testing with a Trackman unit in a controlled setting to really uncover how it will be useful for player development, not just scouting.
And that's what I intend to do with mine, anyway.