I noticed today that the Terrans kept working on the technology victory track past Discovery Sphere in a game where I had turned off the technology victory condition. The only thing I can think of to use those techs for in this situation is to trade them to other civs; since they're very high up in the track, they're valued pretty highly.

If the technology victory condition is turned off, I think those "extra" technologies should be seriously devalued so that the AI's won't want to research or buy them nearly as much.