I should like to know an answer to this too.
Recently I covered a conference and wanted to take a live video feed into FCP together with a centrally generated timecode feed.
Obviously I did not have a deck connected.
In avid you can select an external timecode (deck, internal, external or auto) when digitising, with no deck control
In the end I recorded the feed and then modified the timecode to match a known event, not an ideal solution.
thanks Steve
Steve