Do not rely on speech / motion / touchscreen alone for any commands
Simple digital on/off inputs are the most accessible, both directly in terms of motor demands and indirectly through compatibility with the widest range of alternative input devices.
Always have basic controller input as a backup for people who can’t use more complex methods of input, avoid any functionality that relies solely on complex analogue movement, gestures, motion detection, or speech.
Xbox One patch introducing controller shortcut for functionality previously only available via speech
Next: Associate accessibility preferences with profiles rather than devices