from the Wag's FAQ post about 2.0.....
Q: Why are the Flaming Cliffs 2.0 limited 6 DOF and not full 6 DOF?
A: Unlike the Ka-50 cockpit in DCS: Black Shark, the Flaming Cliffs 2.0 cockpits are not full 3D in every aspect that allows unlimited 6 DOF movement around the cockpit. Yaw, pitch, and Z-axis are as they were in Flaming Cliffs, but X, Y, and roll are limited.
Q: What about including 3rd party models, textures, etc.?
A: While 3rd party developers are certainly free to add these to Flaming Cliffs 2.0 after release, they will not be integrated due to past issues attempting to use 3rd party content and legal issues.