I've been thinking about speed running RE6 however the only difficulty categories are Amateur and No Hope. I was looking to run Normal for my first run (I know I wanted a challenge more of a difficulty challenge) and to maybe go to Veteran & Professional at some point. Unless I'm blind, (which is entirely possible) I don't see any other difficulties. 

{Also I wanted to know on PC, if visual mods are allowed? E.X. Normal costume skin mods and weapons skin mods. Nothing NSFW of course.}