Top request for me :
Could be great with this kind of "collapse/expand" layout (Ultraleecher) with the same command than the classic view (add and add paused). And +1 for the "Open" command (for example to open nzb or play audio files).
(click to enlarge)
Another improvement of this feature could be a search from Download Queue or Par2 Tab by context menu (like Newsleecher below). For example to re-download a corrupted file from another location, or download a missing file.