With Automatic Updating tuned off, you can use NetSync for iTunes to manually copy or link media and playlists between your ReQuest server and iTunes.

Linked files can only be accessed and synchronized to iPods when connected to the same local network as the ReQuest server, but take no space on your local hard drive.
After clicking on a button to copy or link files and/or playlists, the Select Items window will display all media options. Type key words in the filter box to quickly find specific songs, artists, or albums.

Click to
select an item (shift-click to select multiple items), and then press OK to
start the copying process.