Technically there are some items that you could add to the system in terms of sensors, but they would have to tie into current trigger setups. The question is what do you need to add or want to? Proximity/microwave detection sensors while cool can be a real pain in the ***, especially for those people using them to protect wheels as they set up the field so large that every time someone comes within 10' the alarm triggers. Glass breakage is nice and could be added easily. Remote start is a separate unit and if I recall you may loose one key fob to be kept in a small box under the dash so the ecu can see the key when remotely starting. As I recall, the car will remember three key fobs total in memory and cycles them through as you add them into memory.