One of my biggest gripes with HN2 is that there's not all that much to do once you finish the main story. I would love it if there was some sort of system that gave optional objectives to do. These objectives could range from "Attack Mr. Peterson with garbage bags" to "Get shot and successfully evade the Taxidermist" rewards for these objectives could give things such as cosmetics for Quentin, his tools, etc.
#Optional Objectives to do in each house
sterile viper
ripe schooner
Or just optional puzzles to unlock cool items
Either way I think this is a great suggestion