If i check the capability \"Shared Used Certificates\" in the Windows Phone 8.1 application manifest i get the following error:
Error : DEP0001 : Unex
I was able to deploy my app to the emulator, but not to a real device. I got the same error. I asked my contacts at the Phone Team and they said this is a bug and will be fixed with the post RTM updates. It should definitely be possible to sideload apps using the 'sharedUserCertificates' to real devices for normal app developers.
Getting such an app deployed through the Store may be restricted, though. This scenario is primarily meant for enterprise apps, deployed within enterprises.
I wrote a blog post about this.