Multitasking
( Savage Species, p. 37)[Monster]
You can perform different tasks with different limbs.
Prerequisite
Improved Multiweapon Fighting (SS) , Multiattack (MM) , Multiweapon Fighting (MM) , DEX 15, INT 15, four or more arms,
Benefit
If you have four or more arms, you can use each pair of arms to perform a distinct partial action. All such partial actions occur simultaneously. Thus, you could attack with one or two arms while using a magic item, reloading a crossbow, or casting a spell with two other arms.