matt,
Actually 4040 is just smarthomes item number for the IR command console. The actual model number is #IR543 and it only controls 8 devices on a given house code(A thru P). I believe the ActiveHome kit gives you pc or mac software that lets you control up to 256 X-10 devices and create macros for timed events. As far as controling over 8 or 16 devices using the Pronto, I havent researched that capability yet so I cant advise you on that part, sorry. I think Daniel Or Jack from prontoedit.com can answer that question. :)