I want to shoot this camera (GH2) using high speed sync off-camera flash. I have the camera and a DMW-FL500 flash unit. When I shoot with the flash mounted on the camera hot shoe I am able to dial in high-speed sync by setting it to Manual FP or TTL Auto FP. But once I take the unit off the camera and connect it via a sc-29 coiled remote cord from Nikon I lose the ability to set the flash to either FP mode. Does Panasonic offer a cord that I can connect to the camera's hot shoe, and the remote flash at the other end,hat will allow me to access the FP modes in the DMW-FL500 flash unit?