Originally Posted by
irwin
There is a way to move the end of a line by a specified distance by typing without holding down the mouse button. Instead of selecting the line and then dragging the end control (the blue circle) move near the end of the line and tab until you see a small square at the end of the line. Select it. (This will only work if the line isn't joined at that end.) You have now selected the "shape handle" that controls the end of the line. Here are two ways to move it a specified distance:
1) Invoke the Move command. Click on the line end, move the mouse in the direction you want to extend the wall, type the distance you want to move (note that you don't have to hold the mouse while you do this), press Enter.