Quick question: have you thought about porting this to sandstorm.io? Having a one-click "app-like" install would help out many less-technical church folks.

I looked at Sandstorm, but it seems it's in "closed alpha" - how do you recommend I use it?

Only our hosting service is in closed alpha. The source code is all open (https://github.com/sandstorm-io/sandstorm) and there's an easy installer script (though it requires a Linux machine), so you can start hacking any time. :)