What I realy would like to see implemented is something like this:

http://layersapp.com/ From the description: Layers captures every window, every palette, every menu, every menu and status bar icon, every icon on the Desktop, and even the Dock and the Desktop background for each of your connected displays will be saved as a separate, editable layer in the resulting Photoshop image file.

It would make the capture far easier, just capture the whole screen, edit, move the windows, delete compromising top-secret stuff, then save.