I used Raikov to channel my inner Liam Neeson. For dating, I use Sean Connery’s accent with Pierce Brosnan’s awesomeness. 
I think that the guys would love to do more extreme physical change things. Problem is (as I see it) that people won’t obey the listening schedule and end up overexposing themselves. Too much of a good thing is still too much.
But if we are considering some of the mental skills, I’m curious if it is possible to take some of the good parts of things like savantism or autism, while negating all of the bad parts. That’s where those memory-type skills come from as far as I know. People in the more extremes of the spectrum.