HPET in BIOS settings is a feature request I happily support and have been vocal about before.
But ASUS has dismissively handwaved it away too quickly and too often before ... it's obvious to me that (for whatever reason) ASUS simply has no intention of ever implementing it on their new mobos/firmwares. I don't accept the usual "we'll look into it and keep you informed" answers any more because more than enough time has passed and nothing has ever changed ... it's a simple on/off function which was standard issue in past mobos, so it's not at all impossible to implement and it hardly needs exhaustive testing/debugging. I let the results speak for themselves, it's come to the point where I just don't expect it and won't believe it until I actually see it.
I don't usually buy into conspiracy theories, but I do think the conspicuous lack of HPET controls has something to do with licensing/compatibility terms involving Microsoft. HPET has been superseded, but it's not an ancient EOL/legacy technology (like Haswell or Win7) which is simply too old and broken and obsolete to continue supporting forever. I honestly think end-users don't have HPET control in platform firmware because Windows automagically handles these sorts of things and non-Windows (ie: linux) makes Microsoft unhappy.
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[/Korth]