3 Mafia Goons
10 Town Point Keepers
During setup, the mod rolls 20d10. E.g.:
They count how many times each roll appeared. Every townie is assigned a different number from 1-10 (which they don't get to know, of course), and is given a role PM saying something like "you are town, and you have X points," where X is the number of dice that landed on their number. So the sum of all the numbers told to all the townies will be 20.
In the eventual massclaim, town would be able to figure out one piece of information: exactly the sum of the numbers claimed by mafia. From this they'd be able to do a good amount of team hunting. Of course, once two scum are dead, the setup is almost like white flag, as the number claimed by the third scum would be known to all.