Spent some time playing around with the firmware from the pinhole mode you can put this device in to restore a bricked device; over 2KB of free EEPROM so wasn't hard to add. You only need flash the firmware once, and then you can use the repo's included python script to save persistent default custom colors, hardware-driven animations, and software-defined custom animations. When you unplug the device and move it to a different computer or disable host control, the custom animation will play instead of the stock rotating rainbow.