You could also make up some more roles, like:
WILDERNESS EXPERT (Track Feat, Survival, Knowledge Nature)
BLASTER (Offensive spells)
CRAFTER (Craft, Appraise, Knowledge:Arch and Eng, Dungeoneering)
TRANSPORTER (Teleport, Handle Animal, Ride)
STEALTH (Hide, MS, Disguise, Listen, Spot)
DIPLOMAT...