I agree. This one by itself would be more of a waste of programming overhead to make it optional than it would be itself. Only if it was a "recheck all moves" might it be considered. And even then probably not by itself.
I meant that the whole collection of "would be nice but takes too long" would have been good to pile into an option for servers and people at work.
For the original clarified description of this check, I withdraw my comment.
