Shadow men come in four classes , necros, clerics, monk and warriors...
I believe Shadowed men warriors should sometimes dual wield shadow weapons. Right now, in west commonlands, either there are no warriors spawning and monks have weapons in their inventories or the warriors aren't equipping one handed weapons.
I haven't found evidence of this dating back to the classic era but was able to find some stuff posted a few months into Luclin... but I strongly suspect it was the case in classic, I remember finishing the jboots quest during velious era and seeing the rapier equipped on the shadow man I killed in WC.
I know this isn't valid evidence but I'm linking it to show what I mean.
http://everquest.allakhazam.com/gall...ns-shadows.jpg
if anyone else can help find evidence....