Clone from screen... do you believe it is usefull?

[mrkid]

Hi. Working on some photo retouching i found usefull to clone some details from other pictures, elements from background, textures, etc. Usually i navigate that stored photos trough some external program, like could be xnview. Would be interesting be able to "clone" from any portion of the screens you have, instead to open the file in Gimp.
just saying...