Bobby, no. No one has asked for something like that, and quite frankly at a pro event, I wouldn't do it unless they signed something.
Weirdest request I got was lepchenko who requested mains pulled only at the head of frame. She strung something like 50 mains 56 crosses. We measured her frame off the machine and it nearly 3/4 inch longer.
Roger Federer Pro Staff 97 Play test video