Oh, yeah.
Guillaume's Multi-Slot script can assign weapons to perform multiple strikes.
If you're using the RTAB battlesystem, the Connected Attacking script can assign weapons, skills and items to perfom multiple strikes... even with different effects.
If you're using the SDK, then Trickster's the route for you, though his Conditional skills is being reworked.
None gives a final total though.
All available for your perusal in the FORUM SCRIPT LISTINGS (stickied in the Submitted Scripts forum), which is a 'decent' index of the scripts available here. Click on my sig... it's a link.