I think we should make it so when you try to visit an off server residence, you automatically will join that server and then visit that residence. For example, if I had this enabled, when I typed /home (Which is on SMP1) and I was on SMP4, I would connect to SMP1 and then go home if I was in a town-accessible spot on that server. Note that this could be a player setting, so if you didn't want this to happen it would just do what it currently is set up to do.
