Mbsteed
You do not have to do anything special, once you plug in the USB/av cable live view is automatically invoked. I made my own USB/av cable from the one supplied by just cutting off the video out connector and soldering the wires to my tx plug and removed the remaining wire to save on weight.
I use the Canon S95 with chdk set to run an intervalometer script running to take a picture every 5 seconds and can be modified to shoot at any interval. The reason I use the S95 is because it shoots in RAW format and can be set to shoot at intervals and it also has live view feed done to my...