Hi Fco.!
If you dont mind to insert "circular" images from one picture to the other
the process CloneStamp can be used the way you want with the mouse.
Here the description how i did it before Enzo announced his great tool.
(Thanks Enzo)
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Insert Images, or part of one, or more images to another one:
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R=Receiving Image
I=Inserted Image(s) (Usually out of one or more small images created out of preview(s)!!)
Part One:
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Make R active Image
Call Process CloneStamp
Press Reset on CloneStamp
Set Radius to I / 2 (use w or h in bottom line of Window of I)
Part Two:
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Move Mouse to Center of I and Press Ctrl and left mouse,
Release Ctrl and left mouse,
move mouse to R and where you want the image I inserted,
Click left mouse,
You can repeat Part Two as often as you want (also with different I`s)
Click green execute on CloneStamp process window.
+
Close ConeStamp!!
Finished
or Start from Part One.
Aloha
Gerald