We have added a new menu item for clips (video, image, audio, and image sequence) called "Duplicate". It makes an identical clip on the timeline (every property is preserved, including IN and OUT settings).
Also, based on a user suggestion, I have added a new key mapping:
TAB = toggles between the arrow and the trim / re-size tool.
When you combine these 2 features, it really feels good. You can quickly switch to trim mode, set the IN / OUT, and then duplicate the clip, and drag it somewhere else on the timeline. Very nice!