I have an aftermarket Alpine stereo installed and love it. No it's not as clean looking as the factory setup but, it offers the missing features the factory stereo just could not offer. That said the one thing that I really liked about the factory stereo was that it did not shut off until you pull the key literally out of the ignition. Installing the Alpine deck many many years ago lost that feature and I've always been searching for a way around that.
So for the past view days I've been literally sitting in my car trying to find something I could tap the "remote switch" wire from my aftermarket stereo into that I knew would not turn off until the key was pull out of the ignition. I only found two options, was the power windows or into the one of the small L.E.D. bulbs for the window and lock buttons on the driver side door. The down side to this is that once the door opens those stopped receiving power. Not exactly how the factory stereo worked before... but it was close.