EDIT: Ah, I see. Yeah, the Ramza plugin is like $15, which is why I didn't fool with it much.
What it is good for though, is limiting which weapons can be in which hand, and forcing certain skills to use the stats of only one of those weapons. So if you disabled the extra attack (which is pretty simple, honestly) all of your equipment related woes could be solved there.
Also, there was another plugin from mielikki (I think?) which did a lot of the same equipment stuff mine did, but their name on the forum seems to have changed.
Of course, most of what my plugin does for equipment can also be achieved via the equip requirements plugin, and some creative use of the JS lunatic code note tags.
edit: Ah, it was @Maliki79 's plugin:
Maliki's Dual Wield VZ ver 1.8