Panning sound clips

I've been working in a short movie and now it's time to add audio. I need to create a stereo panorama changing levels from left to right several times. It, apparently, cannot be done in version 0.7.7.1.
Obviously I can separate channels, include them in separate clips, and fade them together, but is a little annoying.

Has anyone found another faster way to pan? Ideas admitted

It is on the ToDo list.