Describe the new feature:
The ability to either drag and drop a clip in a track or copy and paste a clip in a track up to the Project File » Video pane

Describe the solution you'd like:
Either :-

1. Select a clip in a track, select Copy, select Project File Pane, press Paste key or Paste Menu option.
2. Drag a selected clip in a track, drag the clip to the Project File » All or Project File » Video

Describe alternatives you have considered:
AFAICS The only alternative to cutup lots of clips is to keep reloading the the original and eraing everything else then saving clips individually. Then import them all separately.