How to make a line longer from the center outward

[westphoenixaz]

I often draw a line between 2 points and need to extend each end of the line by 1.5", making the line 3" longer overall. Is there a command to do this?

[dgorsman]

Snag the line by the middle grip, right-click-scale it, either by reference length or scale factor if you have the numbers handy.

[scott.wilcox]

You can also use LENGTHEN, DElta option, enter the "extra" length, and apply it to each line end.

[westphoenixaz]

How do you apply it to each end?
When I try it only one end is lengthened.

EDIT:
Never mind. I see that which ever end of the line you click on is lengthened.
I customized a button with [ lengthen DE 1-1/2" ] command.
It's pretty quick and works great. The only thing that would be better is a command that added 1-1/2" to each end in one click. I can live with this and it will save me a lot of time throughout the year.
Thanks :)

[jdcincy]

Are you still looking for a better way of making a line longer or shorter than the picked points?