LINKSHEETS for IDIOTS, eh? Sounds like I came to the right place

This is probably going to turn out to be a noobish question, but I didn't see you touch on this in your How-To doc. I have heard some whisperings that there may be some different steps (or maybe isn't possible at all?) if your media is on a network share that isn't directly mapped using net.mounts. I seemed to have confirmed this when I put a (<500 KB) "<movie.ext>_sheet.jpg" file out on my unmapped network share in a movie folder (containing the same <movie.ext> file) with the linksheet option turned on in S00, but still wasn't able to get it working.
Do you HAVE to use the net.mounts in order to use Movie Sheets with a network share? A hair off subject since this thread is specifically about Linksheets, but what about when using the WDTVExt moviesheet plugin, when it is introduced to the Plus?
Thanks!
Jim