Help with Skillful weapon property

[Ionik Knight]

Greetings,

Would anyone be willing to help me with the scripting for the Skillful weapon enhancement?

(Complete Arcane, p. 144)

Price: +2 bonus
Property: Melee weapon
Caster Level: 11th
Aura: Moderate; Transmutation
Activation: —

Highly prized by many arcane spellcasters, a skillful weapon can be wielded without penalty by a character not normally proficient with it. In addition, the wielder's base attack bonus improves to a minimum of 3/4 his level (as a cleric of the same character level) when he attacks with a skillful weapon, though he gains no such bonus with any other weapon, even if a skillful weapon is wielded at the same time.

The skillful special ability can be added only to melee weapons.