how about a port filter for firewalled-users ?
 

for those who are behind a firewall with port-filtering, it would be useful if they could filter the connections. it takes to much time to find other users with no standardport (6346/6347) because the client tries always to connect to any client. by the way
it would be a good idea to run at least one of the hostcaches on another port than the standard-port. For users behind a firewall hostcaches on standardports are not reachable. they have look for other users in some lists like WWW.GNUFROG.COM.