I know that at least the rear lights flash when the car locks (and you can see the mirrors fold). But when walking away from your car, you're not going to notice that (and you probably won't hear the mirror motors). Instead, I'd like to see them offer an option to add a brief honk/some other very audible noise to indicate the car is locked. In my experience, many cars have this today. Seems like an easy config setting to add to the existing security menu.