1) Tbh, I haven't noticed the Y,O having light feel of tactile and no click noise weird. The board is a great build maybe try getting new key caps as the ones the come with it suck anyways.
2) Yeah, its possible but unlikely that a computer cannot run a keyboard through USB, maybe try switching ports or just use ps/2 as what I do so there is NKRO. There is a 6KRO with USB.