Replying the messages send to you would indeed be a nice feature but also a difficult thing to tackle. The Apache web server should somehow start an interactive window for you and I don't think this is possible with Apache server. What was the idea with the webcam refresh rate?
Cell triggering and mobsite view in the Infowindow sounds nice ideas. This cell triggering, or cell info uploading, I have been thinking a longer time now. When time permits I will definitely do something about it. New ideas are always welcome!