Sorry I haven't responded I've been focused on the game, Yes the PS3 Controller should work fine but to be honest I haven't tried yet. I'll make sure the ps3 controllers are working fine if anything is wrong. You can try pluggin in the controller and turning it on first before running the game. The PS3 and PS4 controllers are actually quite different because each button has a different "name" in the code on both controllers. The interface in the game changes depending on what controller is used. If you join in with space bar on the keyboard the interface should show Q and E and BACKSPACE etc., Square and Circle for ps3 and ps4, and A B X Y for every other controller. It might be reading a plugged in controller.
I'm working on a car reset now similar to mario kart where the car resets to the nearest road. Theres 6 new Weapons and 6 new vehicles available both in-game currency shops and through paid dlc. Eventually the houses are actually going to be indoor puzzles but there will be lot more destructable things around the world.
The shopkeepers also has lots of new items randomly including the weapons and lots of new Items.
Stay tuned, Update coming very soon,