There's a line in the config that says " "Electrotine Ore retrogen"=false ". I guess if you set this to true it'll generate in already explored chunks, but I don't actually have any experience with this. Luckily my own RFtools mining dimension is brand new and doesn't have many chunks already generated, so I won't have to wander far to have electrotine generate. Retrogen will probably work but if it doesn't and you don't want to start a new world you can always set one of those up - or a Mystcraft one but I don't know much about that.
If you want to make a RFT dim you need a dimension enscriber, empty dimension tab, dimlets (a good list of which to use is here: github.com/McJty/RFTools/wiki/RFTools-Dimensions), and a creative dimension builder will keep the dimension powered with no fuss (I personally don't consider this cheaty when it's just a non-op basic mining dimension). For teleporting there you can cheat in a teleporter probe with NEI or set up a dialing device, matter transmitter and reciever at each end (these need to be powered - you can use a creative energy cell if you want to do it for free). Good luck
