Because it seems the Developers are not interested in a complete Class/Skill Overhaul I will only balance the Weapons for them ^^  Would you prefer only 2 Weaponsets with 4 Skills each Weapon or 4 Weapon Sets with 4 Skills each Weapon or 2 Weapon Sets but the Two Handed Ranged Weapons are Combi Weapons with 4 Different Skills?

A Combi-Melter-Flamer  would have 2 Melter Skills and 2 Flamethrower Skills.