Is it doable to insert a new frame?

I have a question regarding the mightiness of Reshade shaders. Let's say we have a 50 Hz monitor:

1. Does Reshade know of the 50 Hz / 20 ms refresh rate?
2. Can a shader copy the current frame and use information about it on the next frame (when the next one is ready)?
3. Can a shader delay/time how long a frame will be shown by placing a new frame into the back buffer?

I have created a small image for this last question:

No, this is not possible with the features ReShade exposes.

If we ever want temporal reprojection we should definitely have this