Scandouble FX option missing in these cores...

[KremlingKuthroat19]

I just wanted to report that the Scandouble FX option is missing as an option in these arcade games:
-New Rally X
-Popeye
-Rally X
-Sky Skipper

I'm wondering if this could be fixed by simply adding a line into the MRA or RBF files or if this a feature that needs to be added to both the Rally X and Popeye cores. I personally like to put the Scandouble FX to 2X and make add a Scanline (Sharp) filter for the best picture quality, but these seem to be the only games I'm come across that are missing the Scandouble FX option.