(Please note that using this system requires a lower BAB for all classes, and is intended to work with a number of related systems, such as armour as AC/DR and wounds/vitality)
Weapon skills are used somewhat differently from standard and psychic skills. When you purchase a weapon skill, your skill ranks are directly added as modifiers to attack rolls, damage, or your Armour Class, as described below.
Combat Modes
When using a weapon skill, you engage in one of six combat modes. If you do not declare what mode you are using during a round of combat, it is assumed that you are using the standard mode. Not every weapon skill allows for every combat mode; see the skill descriptions for details.
The table below shows the effects of using the various modes. You cannot have fractional modifiers; where division leaves a remainder, it applies to the first roll listed. Thus, the standard combat mode applies half your ranks to your attack roll and half to your damage. If you had three ranks, the standard mode would give you a +2 bonus to hit and a +1 bonus to damage.
Some weapon skills also have an Armour Check Penalty. Where this is the case, subtract the Armour Check Penalty of the armour you are wearing from the number of skill ranks you have available to spend. This cannot reduce your skill ranks below 0.
(I can't format tables on EnWorld worth beans!)
Combat Mode Description Effects
Accurate: You care more about where you hit than hitting; you target vital areas: All skill ranks go to damage
Aggressive: You care more about hitting than where you hit: All skill ranks go to attack roll
Brutal: You seek to inflict massive damage with each stroke: ½ skill ranks go to damage, but weapon’s threat range is increased by 1 per 4 ranks remaining (or portion thereof)
Defensive: You seek to protect yourself as much as you seek to strike your foe: ½ skill ranks go to Armour Class, ½ skill ranks go to attack.
Fully Defensive: You seek to protect yourself at all costs: All skill ranks go to Armour Class
Standard: You seek to make a balanced attack: ½ skill ranks goes to attack roll, ½ skill ranks goes to damage ("When you can balance a tack hammer on your head, then you can head off your opponents with a balanced attack"

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