I had an another idea for a stamina table replacement based on some of what I heard people brainstorming during errata. Heath and Aaron helped me to flesh this out.

The concept is each weapon type is granted a free use of a specific special attack or defense once per day. This is limited to only those attacks/defenses with Skill +1 as their prereqresite. The character would need to have at least Skill +1/Backstab +2/Strength +1 before having access to this ability.

Here's what we've come up with so far for the types and what attacks/defenses they get:
Small Bladed- Feint
Small Blunt- Waylay
Short Bladed- Pierce
Short Blunt- Deaden
Long Bladed- Critical Strike
Long Blunt- Deflect
Two-Handed Bladed- Disarm
Two-Handed Blunt- Trip
Great Bladed- Break Weapon
Great Blunt- Break Weapon
Bow- Critical Strike
Crossbow- Pierce
Brawl- Capture Weapon
Sling- Deaden
Atl-atl- Critical Strike

I know Waylay is a stealth skill rather than a special attack, but we thought it'd be more fitting than any of the special attacks we had to work with. However since it is one of the big tricks for rogues, we could limit its use exclusively to those with Backstabs.

Also, if you guys like this idea Heath thought it might be good to combine it with Zach's suggestion for headed weapons doing more damage.

I think the way it's laid out right now it hadn't been decided whether or not you would need Skill +1/Backstab +2/Strength +1 to use these innate effects.  I would agree that you should need to have some skill in the weapon beyond basic proficiency in order to take advantage of its unique qualities.

Something that wasn't really mentioned; I'd say that Piercing weapons should get the Blade effects in this system.  The Blade effects are pretty much what I'd envision for Piercing weapons except for maybe Disarm.