Just curious, do you think they'll get around to exposing the needed interfaces in future releases? Judging by some of the dev posts over on Unity's forums, it seems there are many 2D related features they didn't get to in 4.3.0 but do plan for later revisions. (rigidbody2d.movePosition, for example)
Is there anywhere we can go suggest to Unity we'd like this functionality? If so, it might be good to point your users there when they ask. There's issuetracker.unity3d.com, but I'm afraid I'm not sure exactly what to ask for.