In his Popular Network Preferences applications and comments blog post, GSoC student Andre Alves Garzia gives a great comparative overview of network preferences apps in OS X, Ubuntu, Windows and ZETA, as a means to look for the ideal approach for Haiku.
Andre's post actually reminded me of a few ideas that I had quite some time ago about a BeOS-like way for handling network/email/printer settings (in ZETA, back in the days when I was using it), that I think would still apply for Haiku. I don't know if they are within the scope of what Andre is doing and, not being an engineer, I don't either have a clue whether these ideas can be implemented or not. But I will present them anyway, even at the risk of exposing my sheer ignorance. :)