I've mentioned this before...and this thread is cause to mention it again.
While HE with HSM is not a UL Certified Alarm system it is indeed being used in a manner that would be well served by having some " conditional, timed, self healing " without having to go to RM to get it. It's standard practice in the Security System industry and required to be implemented in certain municipalities.
For example in descriptive terms;
the sensor that triggered this alarm condition is no longer in that state, after X minutes, turn off the reactions to this (ie. sirens, lights, etc.) and reset HSM
the sensor that triggered this alarm condition is STILL in that state (possibly faulty, battery on last leg, or the cat is atop the curtain rod playing with it); after X minutes assume all the neighbors are now standing outside your home seeing no problem and wondering how to turn off the friggin siren & flashing lights because you aren't home, so turn it off and reset HSM.