My understanding, but I am not 100% sure, is that only the EDGE Green, not the one you have, can pass-through [no processing allowed] 3D content. Sorry.
Other than turning off all processing I don't think there is a direct video pass through either on the non-Green units. Doing this should effectively be just as good, I would think, although theoretically it would be nice to bypass the circuits entirely, yes.
I own the original Edge. It will absolutely pass through 3d. There is an option in the settings to enable it. You might need the latest firmware for this option, I'm not sure. After going 4K, I'm not using the unit as much as I used too, mostly to upscale LD and S-VHS sources.It's time to say goodbye to the edge.
I better buy a hdmi switch with edid , so I can still use my old yamaha rxv1800 and enjoy 3D (and 4K) on my new Epson tw9300