Actually, adding a fingerprint reader here along with allowing it to be used by the OS for FIDO2 and secondary authentication for systems that don't use full FIDO2 would be quite a coup in the gaming keyboard world, since the world is moving toward passwordless login in the next few years anyway. Might as well beat your competition to the punch! (It would take some thought to figure out how to deal with an RMA'd or replaced keyboard, though. That's probably the biggest hurdle to FIDO2 built into a device.)
The screen idea is cool, too, but as an alternative to making the center of the dial a screen, you could just build in a screen along the top of the keyboard similar to the iCUE NEXUS and save having to add a second device/cable, etc.