Didn't try yet - however did you consider ppl are working / having meetings / etc - simply don't want to see anything on their screen they don't expect? What about proper notification & maybe 'blinking' icon in appropriate area? Setting could contain even sound and/or small menu appears similar to Battery status..
Functional but a few small bugs to iron out, then want to get a nicer welcome screen up and submit to the Apple App Store. Would love any feedback!