[feature request]Allow resizing of region before taking a snapshot?

[mindstormer12]

How about allowing resizing of region before taking the snapshot? At the moment, it is near impossible to take a snapshot of a selected region if the region is big enough that moving your pointer from one corner of the trackpad to the opposite is not enough to cover this region. Since it's not yet possible to resize the region before taking the screenshot by releasing the mouse button, this is a problem.