'Force Resume' is a bit of a Red Herring. I think it does have a use - but I can't remember what it is - it doesn't do what you think it does.

LimeWire actually sends out a new query once every 45 minutes if you have files in your download queue (not per file).

If you do a manual search that finds a file of exactly the same name and size, LimeWire will try to connect to the new result and re-start the download.

Mark