Impossible to do, supply is server sided, and even on those fover alone coops, you can't change it, because the instruction to add the supply is a move of the supply from the server into the client when your client makes a call into the server, the server is then comparing the room stats and the rewards on the server that are predefined, so, even if you force your client to have an overflow of supply, it'll only give the SP that the server is instructed to do.