Keyboard shortcut to bypass "allow only app store and identified developer apps"

My security and privacy preferences are set to allow only App Store and identified developer applications to be installed. This works just fine normally, but ocassionaly I want to download and install an app that doesn't meet that criteria. It's a pain to have to go and change the preference panel setting and then change it back. I was wondering if anyone knows a keyboard shortcut that bypasses the security setting on a cae by case basis. I have tried opening the app installer holding command, option etc. with no succes.