It will be usefull to have some way of viewing SMS delivery reports.
For example ..i sent SMS to someone , but his phone is not on /he's out of cell covarege/ .... X minutes later he's phone is ON and the SMS gets to him, the only way to catch the delivery report is to see the desktop notificaton at the moment the phone recives it.
Adding a line '%timestamp: delivery report' in the chat/sms window will be quite useful.