Would be nice to be able to vary the playback speed for videos (e.g. 2X, 3X , 0.5X)
I agree. But there may be a duplicate feature request out there already, have you searched? 
Duplicate feature requests would benefit from a link to the most popular version of the request. There are a bunch of duplications of this request. The following appears to be the most popular, with 88 votes presently:
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