I got the Smart 2Tools to work a few weeks ago. Connects to the s29 Port as well - and MIDI to the DAW on the other side.
Mind you, I don't work with the G+ Mix-Computer, pretty much waiting for the Dramastic...
But what the 2Tools does, is connecting the DAW to the Multitrack Transport in both directions, also providing the power for the LEDs in the Buttons. Great feeling to operate the DAW from the Centre Section of the Console.