Using extra siren and entry sensors to interface to other sensors and alarm types

It occurs to me that it would be pretty easy to connect some of the SS entry sensors and extra siren devices to other equipment to expand the functionality of the system.  For me as an electrical engineer this is really easy.  Here are two examples:

1) The entry sensor uses a magnetic reed relay switch internally, which provides an easy place to attach wires on each side to go to another user designed circuit for a user supplied sensor (USS) that presents the normally open condition when not activated and a closed circuit condition when the sensor is activated.  The classic example here are strip switch pads you place under the carpet to detect someone walking on the carpet in that location.  These carpet pads are normally open, and close when pressed with sufficient weight.  So an interface circuit that inverts the normally closed condition of the entry sensor is required.  This is pretty easy to do using a simple relay or an electronic circuit that inverts the NO/NC condition of the carpet pad.  If you do not have pets, these are much much more reliable than using motion sensors, you never get a false alarm from them (again, if you do NOT have pets).

2) For those of you who already have an old "bell box" mounted outside your house, it would be nice for the SS system to ring that bell when the system sounds an alarm inside the house.  This is easily achieved by using the SS Extra Siren to receive the alarm signal, then internally one can tap off the circuit board to close a relay or stimulate an electronic circuit that drives the bell box, using a 12 volt gel cell to power the bell box as is customary (bells take a lot of current).  The circuitry would also have an AC powered power supply and charger to keep the gel cell charged.  This is a more involved project but is easy for me.  Bell box alarms are easily recognized by other people as a burglar alarm going off, and would attract attention, and deter thieves pretty quickly, since all your neighbors will come out to look and see what the ringing is all about.

I am wondering how many SS users would have a need for such things?