A way to use the compositor inside the sequencer, very useful but only for blender 2.49

This video can be considered both a tutorial for a powerful use of the compositor in the sequencer
and a request to developers the blender 2.5
When you edit a video in the sequencer many times happen to need the compositor.
the normal procedure would be to upload the video in the compositor and render a new video to be imported into the sequencer.
But blender 2.49 has a much more interactive possibilities, why this possibility was taken off in ver 2.5 (at least until alpha1)?

Fernando Luceri