thartigh,
My assumption is that the RXCom unit tied to the W800Rf appears to "just" be "standard X10RF" info from the perspective of the MLW800RF plugin. So, there should be a means to display the data in MainLobby. This would have to be verified as the above is a "guess".
There is also a ML1WirePro plugin that is a hard wired 1-Wire solution that is working very well in Alpha. Soon will be in Beta. If you can get a Cat5 wire to your sensor location, this would be the best alternative. We are testing HobbyBoards hub right now to make sure the solution supports a Star Topology as well. More information will be posted once it is in Beta - which should be in the next week or so.
The developer has it monitoring his Geothermal heat pump system (not unlike monitoring a hot tub) and found some very interesting economy minded changes once he had the data to emprically see what was really going on with his system.