I have Snap to Grid on and it snaps to every grid that is divisible by 10. Such as 10, 20, 30, 40, etc.   How would I change this so that it snaps at 5, 10, 15, 20, 25, 30.  Basically I would like it to snap to coordinates that are divisible by 5.   Also how would I change the behavior of the nudge buttons and keyboard arrows to match this behavior.

Thanks,
Ashley