Would like to vote for this as well. I have the alarm panel component working great but would love to also see sensors added in some way. I had limited success with Honeywell 5800 series 345Mhz door and window sensor integration with HA but sensors were not always captured.
There is a running list of events you can capture from Total Connect web interface and there seems to be an events API that could also be used to interpret the events list for an open/closed or motion/trigger state.