The title says it all. You could describe a complete new system or simply pick one from the previous games with some tweaks if you think they're already good enough. As for myself, talking briefly at the moment, I would like a combination of V and IV.   We have a search zone which gets bigger with each star and you are required to either escape the search zone or stay "undetected" for a certain period to lose the cops(this is basically a combination of V and IV). Each cop has its own v