Freehand
Let's say I've finished defining all the shapes, connections, and styles of my diagram and it looks like this:

Not bad, but I have a specific image in mind for the stuff in the center.
I can use Freehand adjustments to just position those stuff, and autolayout will position everything else around it.
info
Freehand mode disallows the moving of objects out of their current scope. If you find yourself wanting to move an object out of a container or into a child, you must do this through the DSL.