nabla: The parallel is that in chess [...]

Yes, I see what you mean now. It's conceptually clean but I still wouldn't implement it because In chess it's game over, while gammons and backgammons occur within the context of a match. My priority for resignations of part of a match would be to score fairly rather than simplistically.

Who would like a sophisticated software to decide about the result of a game ?

Dailygammon already has this in the resignation code. The game is resigned as soon as the outcome is known, with exceptions, I believe, only accounting for the human aspect of playing.