I agree with Mezak that KM BB crews should try to get as much repair as they can.
Therefore, I wouldn't use elite sailors for gunners, AA gunners and engies.
11/11 gunners with 10 or 11 for repair are good main gunners.
9/12 gunners with 10 or 11 repair are good AA gunners.
For engies, I'd only use 10/x/12 for rep/res/eng
A good scout is aircraft 12 with repair 11
A good BO is potential 13 with repair 12 (enables you to take off less recruits later when adjusting guidelines, so you keep a lot of repair) or maybe potential 14 with repair 12. Mine is potential 15 with repair 11, and I regret leveling him (at level 107, I need to take off a lot of recruits to adjust guidelines - that reduces my repair as well).
The only elites worth getting are repair elites.
That's a "normal" setup. "Crazy" people would use elite repairs also for gunners, AA gunners, BO, scout, and even engies (late-classed) and vet the heck out of them...