What is the ABC position on Retroshift? On Gripshift? How about Di2 with button controls (like on a time trial bike)?
I am willing to open the discussion up the the membership. I don't want to be the final arbiter. That said, I did consider Retroshift, and, reluctantly, I think it should be excluded. Retroshift has the advantage of being able to fit a classic/vintage shifter, but it's still the step-child of a brifter. From an aesthetic point of view, it's still clunky compared to a non-integrated brake lever. I don't think there are many people with retroshift bikes but no other brifter-equipped bikes.
Gripshifts. I don't like them, but I see them as similar to bar-end shifters. They do not require an integrated brake/shift lever, so having a gripshift bike will not disqualify you, but it won't earn you a lot of respect either.
Di2 of any kind, including control buttons, is grounds for immediate disqualification in my book.