i found out that i can control my mouse using only my face on macOS. that is genuinely fucking amazing. the scrolling could be better though because i have to tilt my head to move the cursor to the scroll bar, then use a facial expression to start drag-and-drop, then scroll to where i need, use the same expression to stop drag-and-drop and then do it.
minus that part, it's really nicely done. and supports an array of expressions. kudos to macOS developers for the best computer accessibility tools on the market.