I've been trying this with my KPLs and Homeseer. I can't get the PLC to detect an Insteon button press no matter what I try in Insteon mode, but I can get something like 80 - 90% reliability in X10 mode.
Sorry that's not more help, but this technology has a way to go. I'm very sorry to say that, given that I've got a house full of it. Not the best purchase I'ver ever made...