Would like the option to double tap the notification pop-up to enter the app. Also, if I'm doing a quick reply, would like the option of double tapping there as well. Sometimes I'll be halfway through typing a quick reply and realize I want to send it and then another to the same recipient. It would be easier than tapping the Menu button and tapping Open App.
Otherwise an AWESOME job designing this program. It's amazing how many programmers miss the mark, and you guys are bang on. Keep it up!