When I select custom color when editing the skin, I can have an option to change the masking color. However this seems to be mapped to the focus color and changes that instead, so unable to change masking color.
As an aside, I want to change the masking color to #00000000 so that’s it’s transparent. I assume this will mean videos are not displayed as cropped (e.g. a 1.78 file won’t be cropped to 2.40).
My reason here is I have an external video processor which handles aspect ratio scaling to my 2.40 screen, so I want all video rendered at the native resolution (i.e. 4k 16:9). I want my main UI to fill the screen at 2:40, and can live with overlays being restricted to 2:40 area even for 16:9 video playback.
I assume there’s an incorrect mapping in one of the xml files in the skin, I can try and figure it out, but never worked in kodi or skins before so may take a while
Will check this out and get this fixed 
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The problem is in SkinSettings.xml, under section <control type="button" id="324">.
However, making the transparent (#01000000, #00000000 made the masking white), then the background extended underneath. i.e. this is needed to mask aspects of the UI not just video.
So this won’t be useful in my case. I was really hoping I could use this skin for scope UI only, while video filled the frame. I’ll have to use the regular skin for now, unless there’s a way remove the masking when there UI is inactive (not sure if this would affect rendering of subs).
I tried out MyScopeNox, which has the behavior I desire. i.e. video playback uncropped (so will overflow the specified aspect), UI is fixed aspect.
So in my situation ideally there would be an option “Don’t mask video”, with the UI (and sub rendering) limited to the configured aspect ratio in the skin.
Not sure how easy this would be - maybe just don’t render the mask when in the video player is active/rendering.
I had another look at this. The button in question will be fixed and I’m working on the option to set the masking colour to 00000000 resulting in entirely transparent masking bars.
Sry for the really late reply here - the last couple of months have been crazy busy here 
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