I sent the dev an email, but in case he is monitoring this thread do you guys think it would be helpful for the current application to display if it is already backgrounded?
In all honesty, no. If it's already backgrounded then it's not going to be backgrounded again. Unless you wanted to explicitly un-background an app while using it and obviously weren't sure if it already was.
I suppose the option to do so wouldn't be too bad.
Would be good to speak to the author about this app to implement some nice functionality but keep its ease of use. It's already really simple and does what it should, adding more functions could cause it to be pointlessly complicated for some users.