sharing is the default setting because thats what the hippies would do.
you can edit the types of files shared, change them to c;cpp;xml;xyz etc because its less likely for you to have those files on your system
i was amazed at the amount of files that limewire wants you to share by default.. no wonder i saw people's contents of their c:\windows\system32 being shared on limewire because i thought that was very odd.