All weapon types have modal abilities if the wielder is proficient with the weapon. Here are a few examples:
War Bow - Overdraw: Lose Accuracy, gain Penetration.
Hunting Bow - Rapid Shot: Lose Accuracy, faster Recovery.
Blunderbuss - Powder Burns: Shooter is Distracted, gain Burn damage cone.
Rod - Blast: Slower Recovery, gain AoE around target.
Dagger - Parrying Blade: Lose Damage, gain Melee Deflection.
Club - Bewildering Blows: Lose Damage, reduce enemy Will.
Mace - Rending Smash: Slower Recovery, reduce enemy Armor Rating.
Rapier - Needle strike: Slower Recovery, higher Accuracy.
Sabre - Windmill Slash: Slower Recovery, higher Penetration.
Morningstar - Body Blows: Lose Damage, reduce enemy Fortitude.
Great Sword - Savage Attack: Lose Accuracy, gain Damage.
Pike - Exposing Strikes: Lose Damage, reduce enemy Deflection.
Pollaxe - Engaging Threat: Lose Damage, gain +1 Engagement.
Small Shield - Binding Block: Slower Recovery, gain Accuracy on next melee attack when missed in melee.
Large Shield - The Wall: Can't Move, dramatically reduce incoming Ranged Deflection and Reflex Damage.