This mod fixes the absurd aim sensitivity you've probably experienced while ADS'ing with a firearm that has an optic on it.
No, just adjusting your menu sliders does not fix this issue. Equip two firearms, one with an optic and one without. Switch between them and test your ADS sensitivity with both. That's where the issue lies. Not with slider values.
This issue has been in the game since Day 1. And even console users have it and have complained about it.
You can even see, in the Bodhi character pack spotlight, how slow the guy in the video aims with the scope because that's how much the sensitivity is increased.
Another issue OVERKILL forces their community to fix. Just like the missing vertgrip for the Vector smg. HEY, OVERKILL. SOME PEOPLE CAN'T AIM SO GODDAMN FAST ! FIX THIS BUG !
Credits:
Guy who originally posted the code on the PD2 forums