Is there such a thing as a "master IPO window" that shows the keyframes lined up, one on top of the other, of all the animated objects in a scene? Something like the "action window" that shows all the bones. It gets a bit frustrating to pull a few frames out of the middle of an animation - and have to go around and select individually every object to move the proper keyframes.
If not, it would be a great idea. Something like the EditWindow in Lightwave or the timeline in After Effects (the program I'm most familiar with). It would have the names of all the animated objects lined up on top of each other with a pull-down beside it to reveal the pertinent keyframes on an IPO timeline.
All IPO keys are shown in the NLA window.