i believe LnS has rules for gnutella, try using those and change the application to that of limewire.
try using the shareaza rules and delete everything but the two gnutella rules. then duplicate them (one set for g1, another for g2 if neccessary). change all four rules to the limewire executable and change the ports as necessary.
these are the two gnutella rules: http://img91.imageshack.us/img91/2497/lns6tg.jpg copy them and change them to gnutella2: http://img11.imageshack.us/img11/7114/lns24uf.jpg i no longer use shareaza but i hope u can get it working