Weapon group choices shall replace the discrete assignments of automatic weapon familiarity by class. All classes, including Wizard (a change from the base rule in Unearthed Arcana), receive the Basic group, consisting of club, dagger and quarterstaff, and the following number of groups:
Some races gain free weapon proficiencies or are innately familiar with particular exotic weapons, usually those woven into racial heritage and upbringing. Those proficiencies are on top of those granted via Groups.
As presently written, the rule allows the addition of a new Weapon Group proficiency through a feat alone. Feats are infrequent, and the addition of only weapon familiarity seems a heavy cost. Consequently, I propose the spending of skill points, based on class, to allow learned familiarity to a new group of weapons.
Taken from Unearthed Arcana (UA94-97)