If you're not too fussy about results it might not be "that hard" to load a previous layout into dot, and optionally mark the nodes and edges that are allowed t

If you're not too fussy about results it might not be "that hard" to load a previous layout into dot, and optionally mark the nodes and edges that are allowed to be moved (or preferred not to be moved), and run the algorithms on that. It "just" needs someone to work on it, or pay for developers to do it. We wrote a paper about this in the mid 90s and Gordon Woodhull even got a successor of that to work, see dynagaph.org