Just want to support this question. I've had the same issue with my Logitech USB H540 headset.
(the UEFI issue though is one that i don't expect to be fixed, but I switched to legacy and IDE when i want to do a usb boot, and then switch back to legacy and AHCI when i'm done)
But it sure would be good if you all would fix your usb 3 drivers so that usb sound devices can be recognized.
Ironically enough the usb 3 drivers which were included with my board, DID recognized my usb sound device, BUT did not enable any usb 3.0 speeds. And as soon as i updated to the latest, the problem is reversed. now i have usb 3.0 speeds but no usb sound device recognition 