Thanks @andreldm, good one!
I have ;-)
Perhaps I should open a new issue for #2 (closed) then?
I'm seeing two ideas here. I'm not sure which one the OP had in mind, but both seem very useful to me.
Remember the region, so that it can be reused (screenshot again) without selecting it again.
A timed repetition of the screenshot, so e.g. repeat the screenshot (of the screen, window or region) every second (best if customizable). As a bonus, the user could either set the number of shots to be made, or ask for an "infinite" sequence of screenshots (that needs to be dismissed by the user).