I fell across a feat there made it possible to attack with both weapons on a single attack of opportunity. But i can't remember where i found it. and it was not the one from Dragon Magazine.
I'm not sure which book this feat specifically came from, but you can find several versions of it on the Dnd Wiki site and through the SRD. Specific names of this type of feat include Two-Weapon Harmony and Two-Weapon Attack of Opportunity. Both are basically the same, but they have different prereqs.
More specifically for anyone curious, said site is a cesspit of poor homebrew. It is far better to use Realmshelp or D&D toolshop because they do not have any homebrew and are usually pretty good about citing stuff.