Despite occasional requests, I have decided not to implement couple weighting precisely because it can easily be abused. After talking to dancers, I've discovered that both the good dancers and the bad dancers generally don't like couple weighting. The good dancers don't like it because they're always forced to help others -- they never get a really good square because they're never placed in a square with several other good couples. The bad dancers also complain since they too notice that the mixing isn't random.

In any case, I believe that the good dancers should get a chance to get a 'great square' once in a while, and so what if occasionally, there is a square that doesn't get any sequences because they're all 'bad' dancers? A more equitable mix is better than a weighted mix.