Sorry to bring this up again but:
Firstly I am asking this feature as a user and not a plugin developer.
I agree that the " intersection and inference systems " of Sketchup is a great benefit to the novice user but there are occasions where they hurt rather than help the more advanced (potentially paying) user.
As for the coinciding edges after move the user would either have to select the relevant region and perform an intersect operation or make some kind of repair, or even leave it as it is.
I do not see how people can work with large meshes in Sketchup without this feature I am asking.
It should be relatively easy to implement and it should alleviate the performance issue that comes up frequently.
Admittedly there is the danger that a novice user could fuddle with this option and start complaining about behavior, but that is surmountable.
regards,
Ogan Ocali