I'm going to assume you've messed with other virtual panel apps, maybe even PowerGrid. One thing I miss about PowerGrid is the sounds. With PG, you can set custom sounds to play on either the PC or the touch device, and that gave you a audio conformation you pushed a button. PA/io could really benefit from this. Is it planned? I'd assume its possible, but I don't know code, so I don't know how easy it would be.