ermm... if you dual wield weapons like katanas, daggers, swords (even small axes) and other, small, light weapons, you're able to strike quicker, but your power on each strike doesn't change... also: jagex would have to make sure some weapons can't be dual wielded (I'm think of bows, spears, mauls, whips, ... ), some other restrictions that might make it work: only usable if you're wearing light armour (chain) cuz in plate? I don't think so... just writing down as inspiration comes up :)