So as I have been reading the 600ex-rt is not capable of second curtain sync when wirelessly using the flash even with the OEM speedlight transmitter (ST-E3-RT). When I bought the flash and transmitter, I wasn't using second curtain sync all that much so I did not really look into his capability but now I would like to have the flexibilty. Is there a work arond for this?
I don't see why Canon flashes cannot do this on a canon camera when third-party flashes can. I have Phottix Mitros + radio flashes that do second curtain sync off camera. They also let you adjust the zoom remotely.