usb limits

USB limitations

Each emulated USB device consumes a limited hardware resource called endpoints. On the default PiKVM, you can add only one or two of additional USB devices depending of its endpoint requirements.

See here to get more information about the endpoints, add devices and flexibly manage the configuration on the fly.

Also note that all USB devices uses the same USB identifiers as the keyboard, mouse and other stuff. You can change everything together, but not separately.