Weapon Focus

Obsidian has not stated if weapon focus will be included in NWN2, however it is a popular choice and easily implemented.

3.5 Weapon focus
Type: General

Choose one type of weapon. You can also choose unarmed strike or grapple (or ray, if you are a spellcaster) as your weapon for purposes of this feat.

Prerequisites: Proficiency with selected weapon, base attack bonus +1.

Benefit: You gain a +1 bonus on all attack rolls you make using the selected weapon.

Use: Automatic

Required for: Weapon specialization

Special: You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new type of weapon.