Don, I think the pre-flash is a common problem with most digital cameras and flash. I found that even if I switched to fully manual mode on the camera, the built in pop-up flash would still give a pre-flash, which, as you say, precludes the use of cheap optical peanut triggers on remte guns.
With my "Yellow plus Blue" shots, I found my synch lead wasn't long enough and had to use my Metz 58 on the hotshoe, set to fully manual mode (this turns off the pre-flash trigger), triggering a simple "peanut" on a very cheap/old flash in full power manual mode. Power output from the remote gun was fixed at full - the only setting available. Light output to the scene was varied by changing flash to subject distance.
Hope this helps someone.
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