I'm sorry, but there is no way to make Geneva work with DX10. If there was, we would already did it.
We believe that DX10 mode is not really usable, since there are issues even with default airports and no, it's not just LGSS, but also KLAS and KFLL, and our sceneries are not the only ones that do not work at night with DX10.
The earlier ones worked, because the ground was made in a less advanced way, which in several cases, lead to some complaints about textures being blurred, especially at JFK, which is compatible with DX10.