No, that's not what I'm talking about.

I am referring to BNC services shell providers may provide. So, instead of typing /server SHELL-SERVER PORT-NUMBER PASSWORD, then /quote conn SERVER PORT, I could just type /server SERVER PORT and the IRC client itself would handle it in a "set it up and forget it way". That is, it's like it's not even there.

irssi does do this, as I recently tested it.