I believe this was added in v.3.1 back in Sept. '12. Take a look at the IAP User's Guide for "Wired Bridging".
If this is just a P2P link you might take a look at our MST200. This is part of the AirMesh family and is a single-radio (5GHz) AP with an integrated high-gain directional antenna. This is perfect for a P2P link and will be a better value in this case.