This one is quick and simple. If you need to park without the handbrake being engaged automatically, such as after running a few hot laps and you just want to keep the pads from bonding onto the rotors while it's all glowing orange, then you can!
All you have to do is keep the handbrake switch depressed (i.e. in the handbrake-off position) while you turn the engine off with the Start/Stop button.
That's it! The handbrake will not auto-apply and you are then free to get out. Just make sure you chock the weeks if it's not perfectly flat though, the 600 with it's open diff really does roll remarkably well on anything except a perfectly flat surface!!
Note: I have also discovered that if you start to rotate the wheels (i.e. jack it up and start to remove a wheel) then it will suddenly apply the handbrake. I think it may be using the wheel sensors, or some other motion detection method, to decide that it has started rolling unintentionally and to try to save itself before it disappears down the pitlane...