There is a parameter in the Zone Marker, to "Modify at xx Scale." Once you turn "ON", you get a diamond (stretchy) hotspot. If you use the Stretch command, and that hotspot, you can move the marker at that scale.
You will know it's working if you get a small coordinate palette that pops up with "X-offset" and "Y-offset" in it.
I've been playing with ways to make it modifiable at every scale, not just the few listed, but am really stuck on how to make it work on ceiling plans as well.
Tom Waltz