why would you want to?
you need to up the vcore if your clock is unstable
you find out the clock is unstable when your pc crashes/bluescreens
which means you need to reboot meaning you pass the BIOS entry point where you can have much safer control over the vcore.
Don't see any point tbh, more opportunity to trash your board frankly.
i was asking for a mate of mine, he is overclocking on LN.
when overclocking he just wanted more control of vcore than whacking it straight up in bios.
says it all - his requirements are more than the usual and I can see how having a live voltage control would be useful - especially if he's trying for suicide shots using a windows based oc programme.
Would be useful to be able to boot up in a controlled manor and then once you're ready, up the voltage and clock the nuts off it!