i think it's a really cool concept, but in terms of how many departments or ppl will buy it for functionactily, i don't think that it'll be something that catches on widespread. The only time that i personally can think of an officer maybe needing to use the remote to operate the lights/sirens is if he/she is pinned in an altercation with a suspect, and the officer wants to scare the suspect by thinking that backup units are arriving. Other than that, I personally am not sure that I'd see a need for remote access to a patrol car other than how K-9 handlers have remotes for the cages on their vehicles and maybe an officer running to his vehicle for extra firepower in an emergency and opening the gunlock as he gets closer to his unit (to save a few seconds by having it open once he/she gets there). Again, this is just my opinion. 
