If you hit “S” to reveal the scale properties, there will be a chain linking the two properties(constraining them). I just tested it though, you can have them unlinked and still use the shift key to scale proportionally.
This is how I “shift” scale. Create a new comp & new solid “cntl+y” and click on the solid. You should see 9 handles placed around the edge of the solid. Grab one of the handles by left clicking it and start dragging, now press the shift key.
See if that works for you.
Johnny Cuevas, Editor
Thinkck.com
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.