The "thinking" is, keep it simple and controllable
well, i'm not sure why you imagine that preventing a singer from setting the pitch on their own song is a good thing? wouldn't it be better to allow the singer to set the pitch on their own song, rather than being forced to make you do it yourself? Wouldn't you rather be paying attention to other things like running the show and shmoozing? And if the singer knows that "Rebel Yell" has to be pitched down two, then let them do it?
I still don't quite get your thinking.
"Simple", sure. If the singer doesn't know or care about changing the pitch, they're not going to do it, right?
The "etc" is anything other than, Login, Search the Library, Add yourself to Tonight's List
I think you're thinking too hard. the "wtkJams" app doesn't let the Singer do anything to other Singers or to kJams itself. They can only manage their Tonight, Favorites, and History. I don't see a reason to NOT let them see what they have sung before (if any) or NOT let them make a list of favorites. They don't HAVE to use either of those if they don't want to.
I think if you just play with it, you'll understand more.