This component does not seem to work in IWD. I tried it in BG2 and I can assign three pips there, but IWD only does the standard 1 (unless the kit already allows it). At first I thought this was a conflict with restoring the original weapon proficiency system with the Tweaks Anthology, but it's the same even on a clean install
EDIT:
Ok, this may a bug with the base game after all:
https://forums.beamd...er-maybe#latest
According to what people are saying here this could only affect character generation, but you can put in more points later