I can't agree more. I'm sitting with over 300MB of incomplete files, with the inability to resume the download.
A feature that I'd like to see is the capability to rename the incomplete download file since often the same file(s) exist, but with a simple name-change.

Another feature would be the ability to drag-and-drop from you incomplete list to the download area, immediately resuming the download.

Agreed, that all other bells-and-whistles don't mean a thing unless you can resolve the ability to resume incomplete download of files.