Great tip. I do large environments and have never thought of that.

I usually hop between the main camera and perspective camera. I set the main camera to were I want the shot to be taken and do all my setting up in the perspective camera.

If you do an undo when in main camera mode the undo also undoes any  positioning you have done of the main camera.

However if you do an undo when in perspective camera mode the undo doesn't effect any positioning done of the perspective camera.