The default Maya Edge Slide tool is a bit difficult to use when I need to offset an edge loop from one side, because it doesn’t maintain a consistent distance in either Relative or Absolute mode. In some cases, I want to add a supporting edge loop, but Insert Edge Loop doesn’t work well on faces with n-gons. Combining this tool with the Polygon Cut tool would make the workflow much easier.
How to use:
Select an edge or edge loop, run the script, then hold the middle mouse button and drag to adjust the distance.