Well, those have their own skills, apparently, but I don't know if they contributed to the same level as the combat skills, or if they're counted together. Like, players have a level, but also individual skills with levels in two main categories, support and combat, which was never fully explained what contributes to the main level. Maybe a split of EXP goes partially to the main level, partially to the skill level, kind of like Skyrim or something? Should we improvise? 

In short, I have no clue either.