Improved Two-Weapon Fighting

The character is an expert at fighting with a weapon in each hand.
Prerequisites: Dexterity 13, Two-Weapon Fighting, base attack bonus +6.
Benefit: The character gets a second attack with his or her offhand weapon, albeit at a –5 penalty. Also, this feat allows the character to use a mêlée weapon in one hand and a ranged weapon in the other.
Normal: Without this feat, a character can only get a single extra attack with an off-hand weapon, and both weapons must be of the same type (either both ranged weapons or both mêlée weapons).