why, there is no RAW and if i were to allow this feat which I wouldn't I'd let it work equally for a wizard as it does a warlock an entire cantrip of damage on a both targets. Warlocks give up a absolute crap ton of casting power to be the best cantrip slinger out there, a single feat letting a wizard trump them in their specialty does not sit well with me.
Not all options need to be equally optimal for all classes.
Not all options need to be equally optimal for all classes.
How to add Tooltips.
My houserulings.