Hmm... there's a bunch of questions here.
A 30-foot run is a long way to go for servo wire (for the power), and USB is only rated to ~15', if I remember right. This is how I ended up going the DMX route at the Heritage Haunt (we had ~150' run), but you already have the SSC32, so I'll go from there....
First, there's going to be a little doing here, no matter how you slice it. There's two important things here: 1) running power and ground to the servos through long skinny wires = bad, 2) when running signal (pulse) over a long distance, make sure it's protected from electrical noise.
Here's what I'd reccommend:
1 - Put the +5v power supply near the skulls.
2 - Buy this
, and connect the servos to the header pins on the circuit board.
3 - Connect the power supply output (+5V) to the circuit board at the + and - connections using 18ga speaker wire. This will require soldering, but it's only two wires. Besides, soldering is fun
4 - Pick up a bunch of these
, and some CAT5 wire (or 5e or 6, whatever).
5 - Crimp the male pins onto one end of your CAT5, and the female pins to the other end. (you can find a cheapo crimp tool at Radio Shack)
6 - Pick a twisted pair, and plug these into the 'Pulse' and 'GND' positions of one of the plastic housings. Don't worry about the '+' aka 'VS1', 'VS2' signals. These won't be needed. Wash, Rinse, Repeat - once per servo required.
7 - Plug one end of each extension into a wire emanating from the adaptor circuit board. Plug the other end of the extension into the SSC32. Make sure the polarities are right (each wire matches up with its proper signal)
Hope this isn't completely confusing. Near as I see, this involves the least soldering, and still has a good chance of success. You're still sending the pulse signals through skinny wire, but that's okay in this case. There won't be any current in these wires, since you're supplying all the power locally from the power supply. Do keep your spiffy new CAT5 extension away from any other wiring - you want to minimize the electrical noise. Also, if you happen to pick a shielded CAT cable, connect the shield drain wire to the - connection on the adaptor circuit board - this will further shield the pulse signals from electrical noise.