Where #M=the number of minifigs in a line passing the weapon forward and
WS=the size of the weapon being passed forward.
Thus one minifig could use this on a size 2 melee weapon with a UR of 4 (intentional), Range of 2" (about what he can hit anyway), and damage of 2d6 (again, intentional). But, say, five would have a UR of 8, range of 6", and damage of 6d6.
I guess the lead minifig would roll for skill.
Might suck, but hey, I came up with these in under five minutes.
This should be in the Rulebook somewhere:
"Any problem on earth can be solved with the careful application of high explosives"
-Valkyrie (the movie)