Fix first the delay in X11.
Actually both for region and window screenshots, it makes no sense to
delay *before* region or window selection. Usually when one uses a
delay, the point is to prepare in-between selection and shot. For
instance, I often used a delay to snap the contents of a menu because
PrintScreen key would not work when a menu is opened. So I would set a
delay, select my window/region, then quickly open the menu before the
delay is counting down. This would not be possible with the way delay
occurred (before selection), which just has no use that I can see of.