Jesse ~
You've posed a relevant question that I'll attempt to answer as a AN post-op, post-radiation patient.
As the previous posts indicate, there is no template for the extent of post-op (or radiation) vestibular deficits and their effect on hand-eye coordination. As you can see, some have very few coordination issues (I would be in that category) while others have some noticeable issues. There are so many variables when dealing with these tiny nerves encased in a very small area that it makes predictions regarding the effect on functionality post-op, even 'ballpark' predictions, almost pointless, although we all want some idea of the after-effects of treatment. I did, but my very experienced neurosurgeon was honest and stated that he would do his best to spare critical nerves but he simply couldn't give me a credible expectation of exactly what to expect, post-op. As you know, lots of things can 'go wrong', including facial paralysis, permanent unilateral hearing loss, eye problems, headaches and so on. The good news is that none of these issues are inherent in the procedures (surgery and/or radiation) but simply a possibility. I didn't suffer any of the more common deficits and I underwent both surgery (retrosigmoid) and radiation (FSR) on a large (4.5 cm) AN at age 63. I hasten to add that my case was not anomalous and that many other AN patients that are or have posted their stories on these forums have similar accounts to offer. There is, indeed, 'light at the end of the (AN) tunnel'.
I understand that you're (rightly) concerned about the effects of treatment for your AN on your ability to race your Mustang as well as perform your job. These concerns are quite valid and should be addressed to whatever doctor you ultimately employ to treat your AN. For what it may be worth, although I was retired (from a desk job) I had to give up driving for a few weeks prior to my surgery due to 'dizziness' and a gradual loss of hand-eye coordination. I'm happy to report that I was given the 'green light' by my doctor to resume driving within 2 weeks of my discharge from the hospital. I've never looked back, as it were. I mention this as a counter-balance to the harsh reality that some vestibular deficits can lead to a loss of hand-eye coordination. Of course, I hope this does not happen to you but I can understand your concerns and find it admirable that you're seeking answers to this very real concern. I only wish I (or someone) could offer the assurances you would like - but we don't sugarcoat reality around here, Jesse. We're positive, supportive and generally upbeat - but we're not unrealistic.
I know you're seeking something a bit more definitive than 'it depends' - but that is the reality. When you have consultations with doctors and ask the inevitable questions, this one should be prominent. If any doctor offers slam-dunk assurances that you'll have no post-op/radiation vestibular issues that could affect your hand-eye coordination, I would be (ahem) extremely skeptical. As always, we wish you the best as you continue to research and I hope you'll continue to ask questions, even if some may not have a definitive answer.
Jim