BTW, this is a bit of an old reply but with regards to instant teleportation in RFTools, it actually needs RF power on both sides so it is not that easy to set up. I think this makes it fairly balanced.
As to dimensions that's right on server. Although I know servers for RR3 where RFTools dimensions are actually used. One useful feature is that the server admin uses RFTools to make a mining dimension for the players and then disallow the rest of dimension building for the other players.
Anyway, just would like to announce RFTools 2.20 which adds (amongst other things) a new modular scr