Current description:
Fighters are the primary arms specialists. They are warriors and are experts in weapons, as well as tactics and strategy. Fighters find it very easy to develop a variety of different weapons and to wear heavier types of armour. They are less skilled at maneuvering and manipulating mechanical devices such as locks and traps and have the greatest difficulty with anything connected with spells.

My take:
These are not tinkers. The fighter's combat skill set will have only the basic offense and defensive skills, with few noteworthy exceptions (the defense skill, resist stun, etc). All other skills that have an effect on combat will move to the 'special' category (sweep, kick, disarm, etc).

Unique Role: Combat styles (sweep, kick, disarm, defense, resist stun)
Non-unique Roles: Offensive power (100% combat devs), Defensive power (up to plate armour at no penalty)

Considering: Weapon trees - skill in weapon A acts as a bonus to weapon B