I'm submitting this enhancement/feature request to both Autodesk and Esri because I'm not sure whether it's something Esri would control in their plugin or Autodesk would need to provide some additional functionality to allow the plugin to work this way.
Using the ArcGIS for AutoCAD plugin, when adding a map, 1 map unit is always set to 1 drawing unit even when the units are not the same. For example, a map in feet inserted into a drawing in inches would show measurements 1/12 what would be expected.
While it is possible to change the drawing units to match the map units, and there are several workarounds, it should also be possible to scale the map to match the drawing units. I have a few workflows that would benefit from this functionality.