A74 YES !
all weapons can have x4 multiplier if they are Kaorti weapons!
http://www.wizards.com/default.asp?x=dnd/re/20031014a[spoiler]
Magic and Resin Items
Kaorti items are all constructed from the resin their palms secrete. In most campaigns involving the kaorti, the creation of resin weapons doesn't become an issue because the kaorti normally serve as enemies of the player characters. However, a few kaorti turn rogue and seek to find a home within the world, and others would like to wield the powerful ribbon weapons that they find.
Weapons made from kaorti resin require the Exotic Weapon Proficiency feat to wield, and each must be specific to each ribbon weapon. For example, if the character acquires one of the ribbon longswords of wounding wielded by the Guardians of Gloom and Despair, she must take the Exotic Weapon Proficiency (longsword) feat. If she has acquired a ribbon dagger also, she must take the dagger version of the feat as well.
Making magical versions of kaorti items is possible. The item maker must use resin it has excreted itself, and also must have the appropriate craft skill and item creations feats. Kaorti resin is particularly suitable for bladed weapons such as daggers and swords. Any resin item must be made as a masterwork item.
A resin piercing or slashing weapon has a critical multiple of x4
