With standard Pin-header configuration, it can be used with many standard Pico Hats.
This
up to 32 devices on 40m cable can be connected in parallel.
Configurable GPIO can be used to connect to Pin header of Pico-SPE with optional PoDL (Power over Data-Line)
Pressing "Boot" switch for longer than two seconds will reboot in USB-Boot mode. No more fiddeling with the USB cable required.