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A bit of this is already implemented at least in the version from current SVN if you use the Gtk+ 2.x frontend. That is, it has support for pausing/resuming downloads from the context menu (right-click). Exporting/Importing downloads is more or less possible by use of magnet links. The context menus at the search results display (including own shared files and browse host results) as well as the downloads display allows creating magnet links ("Copy magnet to clipboard"). These can be stored in a text file and used later or sent to other people. Admittedly the latter is not sufficiently convenient for larger sets of files but rather for single files. Also currently magnet links cannot point to "firewalled" sources.