What are you talking about? When I middle click and drag the fences all move together across my monitors.
If there's something different going on underneath that makes it so from the point of view of the underlying engine, the fences aren't the thing moving that's great. I don't care. Nor should any customer have to care about something like that.
I'm not interested in your excuses for why it's not possible to drag multiple fences.
I'm interested in you fixing the product to include this RIDICULOUSLY OBVIOUS functionality.