Why shouldn't it support the c_* functions? Those are implement in gamestudio and thus available.

I'm only replacing the render part with material events and two hooks for clearing and presenting the backbuffer.

Speed and performance must be testet but should be equal to the speed of gamestudio - DirectX 9 Render Time + DirectX 11 Render Time.
Only thing that is slower is buffer updating (animation) as this is currently done twice the time (original buffer and then my DirectX 11 buffer)