Well, I'm making a few assumptions on the way limewire works, but I'm bored and have just been sitting here thinking.
I'm assuming that if limewire isn't started no one can search/download the contents of your shared folder, as there's no program to manage the port etc.
Well, what an option so when the computer starts up, it opens a mini version of limewire (background) that will just accept searches and allow downloads of a client chosen bandwidth?
A lot of people probably disable limewire from startup because they don't want the whole program running all the time (I do), so maybe somthing like this would create a whole lot more results?

Maybe this is flawed, but a few beers down it seems like a good idea to me..

Ed