Scanning a QR code from Icenium results in a url to the built .apk. Clicking on that link only downloads the .apk, the user should initiate the installation if he wants and basically once the file is downloaded we no longer have control over it.
On a side note, should you have your app already installed, you do not need to constantly scan QR code upon each change, you can use the livesync feature to update your app to latest bits (menu button on Android, three finger on iOS).
You've missed the Icenium Visual Studio Integration keynote? It has been recorded and posted here.
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