Hm... a side effect I wasn't intending is that TPRs are usually going to get townread when they claim and a counterclaim doesn't appear (rightfully so, because more than half the time there will be three TPRs that scum probably won't cc). This could potentially lead to a follow the cop scenario, maybe? If this is a big problem with the setup, an optional rule could be added:
When a 5PR setup is rolled, mafia have the pregame option to sacrifice a PR. If they do so, whichever PR they keep is removed from the town.
This effectively brings the setup back down to one of the 3PR setups, but this time with WIFOM about whether scum would prefer to have 2 PRs or be able to trueclaim safely.