Since our app uses the built-in iPod Music controller, we activate all the same features that the Music app does. So, your example of showing the album art on the lock screen does in fact work.
This is different than different category apps, like Safari replacements, that can't take advantage of all the built-in controls/features outside of the app.
(I work for szello)
It's the same issue I have with the AirPlay icon on the iPhone lock screen; it is right beside the forward icon and I am ALWAYS hitting forward instead of my intended tap on AirPlay. When you're listening to a two hour podcast, this is very frustrating.