alanback: I don't get your point, IMHO the post-Crawford doubling strategy is a lot simpler than that. As the leader wins absolutely nothing of the game being doubled, the trailer should systematically offer double at move one, the double should be accepted (otherwise the trailer will do the same in the next game having gained one more point inbetween). Then the game is just like a cubeless game, except that it will count twice.
The only exception I could think about is when the trailer needs an even number of points to win the game and he gets a good first roll. Then the leader could decline the double just in that game, hoping to get a better start in all the remaining games.
Or is there another exception ?

aberann: How many points did you expect to get by beating someone 830 (!) points lower than you ?

grenv: That makes sense.

BIG BAD WOLF: Yes, this can easily happen. And also when your opponent has still a backward man blocked by six consecutive squares. Then the fact of not being able to move is an advantage, and you just have to wait for your opponent to break his board, so you will almost always win. So in that situation the only reason not to double would be to try for a gammon.

I am a bit late on this, but many thanks to Fencer for the addition of the game cube ! Now I will start also playing some backgammon here.
playBunny: I agree with you. Although doubling rarely happens more than two or three times in a game, knowing how to handle the game cube probably amounts to almost 50% of the backgammon skill. In many situations it is not too hard to find the best move out of a roll by simple comparison, although you don't even know if you have 25% or 75% of chances to win. I find assessing one's chances to win much harder.