@labris, the big main things we had to do were disable Specular over alpha (which was on by default) and antialiasing since that was part of the certification process. We did leave on specular antialiasing and horizon occlusion even though they are not specified in certification. We also have spherical harmonics enabled and are using a linear tone mapping since the certification group has not landed on a decision about the tone mapping that the 3D commerce group will adopt as its standard.
Both of those last points will likely change in the future for V2 of the certification process from the discussions I have heard from the group in the past. I will also ping @bghgary and @thomlucc in case I missed anything.