Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
I believe the rationale for not implementing an "auto-pass" is that a player must go on and actually make the move, whether it be a pass in backgammon or a forced move, such as in chess. It is frustrating in some situations, but why should the system make an automatic move for a player who is out to lunch? This would also require extra programming.