Apple TV Speed Controls od Useful Little Things

Apple TV Speed Controls lets you change playback speed on the Apple TV website (tv.apple.com) using keyboard shortcuts, plus an optional on-screen overlay and a settings popup.

Features
Keyboard shortcuts on tv.apple.com:
W: increase speed
Q: decrease speed
E: reset to 1.00x
On-screen speed overlay (optional): briefly shows the current speed when you change it.
Settings popup: configure step size, min/max speed, overlay on/off, overlay duration, and overlay position.
Remembers your last speed and reapplies it during playback/navigation.