Playback speed - more options

I am a music teacher and presently the current options (0.25, 0.5, 1) are too spaced apart. For example, 0.8 would be perfect. 

Can you add these in? Example 0.6, 0.7, 0.8, 0.9 Everything else is perfect... 

Greg

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Extra info, I am self hosting the videos not using YT.

Thanks!