Hi Mistrick, sorry I didn't notice this request sooner. Unfortunately, I think this is out of scope for this userscript. Making a separate userscript for controlling playback speed is something I was considering though. Thank you for your suggestion.

The 503 error has been resolved, the new version is now pushed to here as well.

Thanks for mentioning it here as well, to make sure I see it. I primarily check greasyfork, as it is more active than here.

Unfortunately, the website is not currently allowing me to update the script here. You can grab the updated version from greasyfork in the meantime (or github at https://gist.github.com/adisib/1e6b429b9bb630fceb170f3fa77c57a3 if you prefer).

I'll see about contacting the site about the issue, and hope I can get the fix out here as soon as possible.