None of the custom weapons, which I think includes the falchion, short spear, and wind fire wheel, have a feat option for the improved critical feat.

Fighters are currently getting 2 skill points per level, as is vanilla. In this class changelog it says skill points were buffed to 4 per level: https://nodebb.cityofarabel.com/topic/52396/fighter. I don't know if its outdated, but they should be changed IG to reflect the post listed here, or the buff should be removed from the post.