Mentioned up thread, and potentially doing both with the cat eye buttons, but fitting them under the Hylex hoods instead of the climber buttons. I think they'd be a lot neater than the climber buttons too.
For the front derailleur you'd need either a hydro Shimano shifter or the hacked guts of any eTube front shifter. SW-600 climbers shifters can only operate the rear mech.
Ha, yep have seen that. But only ever for the RH, for the LH would you just programme them differently? (Coming from no DI2 experience).
Another option was along the lines of this
http://dinosarti.com/blog/2013/5/23/hacking-the-heck-out-of-my-di2-9070
Mentioned up thread, and potentially doing both with the cat eye buttons, but fitting them under the Hylex hoods instead of the climber buttons. I think they'd be a lot neater than the climber buttons too.