Might need to edit out all the Fo3 items within the config.txt, but at that point I'd say to just use one of the many presets already available on WRF's page that were made just for FNV.
Edit: Was not expecting an FNV version of ROOG to come out, so since I don't have any excuse now I put up a preset for that as well.
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Edit: Was not expecting an FNV version of ROOG to come out, so since I don't have any excuse now I put up a preset for that as well.