I have this sai and it's already a speed weapon. That character will be taking improved disarm. Am looking at the entry for brilliant energy. "A brilliant energy weapon ignores nonliving matter." Obviously intended to pass through armor and such, but also golems and undead. It looks like not only can I not sunder with it but disarm would be ineffective as well.
This character would do well with a weapon which could switch between being brilliant and not brilliant, but I don't remember if turning on/off weapon enchantments was a homebrew thing or if there is an option in any of the 3.5 core rules. Anybody have an alternative to this? I don't want to give up passing through armor just so she can disarm every now and then.