Support of the PLM is one of the things that is in the ALPHA release. The link will get you to the PowerHome forum where Dave announced the ALPHA. Probably too early in the cycle for you to join in based on your post. Dave is another one of those folks who you could not ask more of. I’m sure he will get that into a Beta as soon as he can.
Have you gotten your PLM to work at all. From the number of posts discussing the PLM in the various forums, there may be some comm problems. Really too early to be sure. Have not seen anyone say definitively they have actually proven an issue with the PLM itself. Some say it works with normal Insteon traffic but seems to have problems when the network becomes flooded with traffic. I don’t have one yet so cannot speak from personal experience. Good Luck!