Dragging the cursor around a screen capture

I have the option of choosing something within that screen the size of an icon to take a screen capture of it if I want.

What you have to do is drag the cursor around the part of the screen or icon sized object you want and then take the screen capture.

That is easy for an able-bodied person to do but not for me because I cannot use my hands.

Is there a way to do this using speech recognition and so not needing your hands to capture the part of the screen you want?

Cheers