SUMMARY
I have a project with several video/audio tracks from which I want to delete a zone using the timeline zone extraction. Now two of the video tracks contain composite effects but these get lost upon extraction (hitting Shift-X). It was quite some effort to get those compositing effects for the tracks right, so it would be nice if the compositing effects could be preserved when extracting the zone, i.e. if their length could be cut by the length of the extracted zone (with all the keyframing data _outside_ of the extracted zone preserved).

I managed to restore the composite effects after the timeline zone extraction by copying them to the clipboard and to some text documents and then re-insert them manually to the respective tracks and re-position them, but I think the workflow  would be easier if the GUI could do that automatically.