Those are options in Vimeo itself – that’s how I removed the playbar, volume controls, etc. Those are things that I can control per video, so that whenever it is embedded it always has those settings. The option to autoplay, though, can only be added to the embed code and not set as an “always” setting. So, since the plugin generates the embed code, I can’t go in and add the “autoplay” code myself. I asked about this on the Vimeo support forums, too… maybe this response will help:
https://vimeo.com/forums/help/topic:115728