> I'm trying to put together a patch, but I'm struggling a bit setting up to 
> build.

I just pushed the neccesary changes.
Works slightly diffrent than on x264, as the option it has seems a bit
broken, seeing that both 0 and 1 force IDR frames:

x4->forced_idr >= 0 ? X264_TYPE_IDR : X264_TYPE_KEYFRAME

For nvenc -1, the default, does not forward the flag, 0 forces
keyframes, 1 forces idr frames.
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