ctrlshifts

Pronounced "Control Shifts", this replicates the thing from Windows when you press Ctrl+Shift+S, and it allows you to screenshot a specific part of the screen.

Unfortunately it doesn't freeze the screen yet. So, maybe in version 2.

Also, yes, I know the thumbnail is crusty, that is intentional. Also, I got the thumbnail from a gif, so, yeah. Don't really have much of a choice regardless.