Understood - thanks for the response.
However, the purpose of simulation games is to approximate real-world conditions - be it aerial dogfighting or playing golf. Long Gimmees do not occur in the real world.
As an innovative solution, why not conduct a survey of your current "members" and ask them how they would like to see the Gimmee rule applied? From other comments I have seen, I believe most would opt for a <12 inch rule to be programmed into the software. In any event, let your customers decide - I think they would appreciate such a survey.
As for speed of play, I have noticed that the greatest hindrance to game speed is the loss of connection to WGT servers, which happens with regular frequency in 1v1 matches.