Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Multitasking

( Sword and Fist: A Guidebook to Monks and Fighters, p. 62)

[General]

You can perform different tasks with different limbs.

Prerequisite

Multiattack (MM2) , Improved Two-Weapon Fighting (PH) , Two-Weapon Fighting (PH) , DEX 15+, INT 13+,

Benefit

If you have four or more arms, you can use each pair of arms to perform a distinct partial action. Thus, you could attack with one or two arms while using a magic item, reloading a crossbow, or even casting a spell with two other arms.

Also appears in

  1. Savage Species