Me and my friend would like to be able to connect our servers together. Almost like a multiworld connection, but between two different IPs, and this would also be done by typing /connect ROLEPLAY or /connect BUILD or /connect wars, or whatever the server would be specified as a name.
Currently Minecraft's client does not have a function to tell it to connect to another server, so to accomplish this, you'll probably need a client mod as well.
CraftProxy achieved this even without client-mod, this worked by one of hte servers running a "Proxy" server. This server then secretly re-connected the client between the servers.