AutoCad 2D :: Stretch Modifications Input Dimensions?

I worked for an architect in the past that had a modification of stretch that allowed you to set a dimension. For instance if you had a door way drawn in a stud wall set back from the wall 50mm and you wanted to change that to 100mm you could use the stretch command with another shortcut command to specify the distance from the wall.

The command list would be as follows:

-"s" (Stretch)
- Select objects to move, "Enter"
- Specify the basepoint to move (corner of door in this case).
-Then i would hit another command shortcut from there system. This would allow me to pick the point where i want the dimension to start from.
- Input the dimensions, in this case "100" , then enter to complete.

It seem simple the but very useful for more obscure applications.

I also understand in the application above you could just stretch 50mm across 50mm but this requires calculation. We want to get away from having to calculated all the time.