Yes, Geo, but by turning off Adv Mil Tech, you take away hyper optics. As to gentleman's agreement, I suspect most anyone would prefer something that is more "enforceable" and "verifiable". For my part...I could handle it with the appropriate honesty but the first time that a fleet of mine destroyed a fleet of the opponent, I wouldn't want to have to undergo the "accusation" of "you must have trained them!". God knows I hate spending time training ships/fleets anyway!
Anyway, back to the subject...there is no way to turn off JUST training.