one thing you could do, once you get to 2 people, make sure you save the tournament, and then open or start a new tournament. At some later point, you can come back, start up the saved first tournament and take out the last person and viola, tournament finished and all stats collected
I just re-read your post and thats not what you are asking. I'm not sure of an easy way to do it. You could manually assign points. Or you could run another touranement just with the one table and take out people in order... that would only take a couple of minutes. You would have to delete those players from the original tournament as well so they don't get double points