Please... if someone could work on this it would be very much appreciated. I am working on a project right now that would need this feature. I would really prefer not to have to use the Blender internal renderer to bake with. I'm working on a project right now and we are hoping to have a demo ready by the end of summer. 

The easiest way I can think of to do this is simply make sure the user has the UV they want selected in blender, as well as the faces they want baked selected. Yafaray would have options to set the image size, and I think there would also need to be options to disable reflections and transparency (for selected object only), because those could cause unwanted effects in the bake.