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What can I replace this latching relay system with?

Just purchased a house built in the early 50s. Almost all the lights are controlled by latching relays, with low voltage switches in the walls connected to the relays in the ceiling boxes with 3 conductor cable (there are also some relay-controlled outlets, and I haven't yet figured out where the relays are for those). There is a central transformer, connected to each switch by additional two conductor wires (no idea if they are daisy chained or home run, but I assume the former). There are also a couple of remote multi-function switches, which have a knob that allow you to choose one of 10 or so different relays to control, along with a switch that turns the remote fixture on or off. I assume the remote is wired directly to the remote relays using more 3 conductor cable. Most wiring is similar to what we used to call rotor cable (for wiring up TV antenna rotors), but some is simply three solid conductor wires twisted together.

Anyway, I'd like to replace this sytem with something a bit more modern. Although all the relays work (one or two are starting to give me a little trouble), I'd like to have the ability to dim lights, and even better, set up some automated controls. Is there any system that will allow me to use the existing wiring infrastructure? The walls are plaster so I don't want to tear them apart.

Please respond in the newsgroup.

Thanks,

Steve