... and that shows how little you know about gaming (or PS/2 for that matter) in general.
This is not how it was in the old days.. perhaps you are the one who knows too "little" about the subject?
USB2 (or above) is fully capable of NKRO keyboard handling (well it might fall back to 6 keys during boot if you switch it to legacy mode, but why would anyone do that?), and more to that, modern motherboards are using a special super-i/o controller chip to offer ps/2 functionality, which are much "further" down in the "priority-chain" than the integrated southbridge which handles usb, so it's that super-i/o controller what gets interrupted by the keyboard now.
The main problem here is that most of the keyboard manufacturers are lazy to make their usb keyboards capable of more than 6KRO, but that's only because they do not care and not because of a limitation in the usb standards.
