AbigailII: Although I agree that it would make tournaments go faster, I don't think I would like to join such tournaments, if multiple games (instead of a single match) were mandatory, because I probably would not know exactly how many games I would get (for instance on a 21 points match with doubling cube), and so I would end up (at least on what concerns to my plays only) slowing up the games.
Besides I like to maintain my game number at a low level, so if it was a 3 match game I probably wouldn't mind, but on a 10 win match I (and maybe a lot more people) most likely would not join the tournament, so make this as an option seems to me as the best option