Advanced Selection Tool

Shutter does provide two different tools to capture a region of your screen. The Simple Selection Tool and the Advanced Selection Tool.
Video (Advanced Selection Tool – zoom window)

There is a dialog that allows you to enter the width, height, X and Y position of the selection manually.
Video (dialog)

Window Selection

You’ll see a nice animated effect when hovering with your mouse over the windows on your desktop displaying the window title and geometry of the currently selected window.

Capture menus and tooltips

Video (menu)
Video (tooltip)