Why not just refrain from using head-shots in VATS?
It would require them to change 2000 to 20 in the corresponding game files. This takes a lot of time and resources.
Seriously, though, if you're playing on PC, there is already a mod for this.
Yup if you play on PC there was a mod fix for that bug done in a day or two after release(plus fixes of some other perk related number bugs), but yeah i do agree its kinda starnge this fixes didnt make it into first official patch since they woudnt take more than 15 mins to do for someone that has the correct tools and knowhow. Hopefully they make it into the next one i guess cuz console players cant fix it by using mod.