[wolrah]

Yup. I love Teensies for building USB input devices. It's trivial to get something basic working and not much harder to tweak it if you want to appear differently to the system or use a higher refresh rate for lower latency gaming.

They're breadboard friendly, as easy to use as an Arduino, etc. For one-off builds that need lower power or tighter timing than I can achieve with a Pi I pretty much default to looking at the Teensy line unless I need some kind of wireless communications, in which case an ESP variant is usually my choice.