The Agent is an application and runs under the current account. I'm not sure if it's capable to also work on the lock screen. You would probably want to use the Host instead, as it runs as a system service and grants total control.
The last time it took them about 4 maybe 5 days to approve. Now we see that there is yet another iOS update (9.0.2) and we will be testing the program against that update also once we release the current app update. And it's all over again, if Apple decides once again to release another update.
That would be a potential security hole :) The Viewer, as an application, is never locked. So imagine a situation where a stranger gets access to your computer for a short while (like when you left for a lunch) and peeks into your connection properties.
I'm sorry, but we only distribute the mobile version via AppStore. Also, as you say that you cannot install it on iOS 7, I will contact our developers, clarify the current system requirements and update those on the website.