I'm wondering if it's possible to test iOS 6's smart app banners' app-argument URL parameter on dev builds of an iOS app. It appears the Open option in the banner only appears if the application is downloaded from the App Store.
What worked for me was to download my application from the appstore, and then overwrite it using a build from XCode. This worked and allowed me to debug the smart banner feature using my current build. This won't work from the simulator, you need to use a device.
Just to be clear, you must overwrite it. You can't delete the appstore version, and then build from XCode.