Fine tuned playback speed
I see that there is already an option for the default 1.25x, 1.5x, etc playback speed in the app as there is on the actual website. That's not what this suggestion is about. I think it would be beneficial to be able to put a user defined playback speed such as 1.15x instead of having to rely on the defaults. This Chrome addon explanes well what I am suggesting: https://github.com/igrigorik/videospeed.