I just watched a NOVA program on the local PBS station which featured new safety devices such as seismic bracing in buildings and most importantly... the use of Corn Starch and water which when heated forms a gel (think of thickening gravy) and which turns into liquid when sprayed but returns to a sticky non burnable gel upon contact with any surface.
It is now being used by some Fire Departments and is harmless to virtually anything or anyone, and you can eat it when the fire is out!
My devious mind tells me that if you put Dry Sump Oil Tank blanket heaters around your fire bottles (filled with the gel solution) and with a onboard power inverter, this system might be the answer to toxic Halon extinguishants, or Soapy solutions such as ColdFire (which are in fact not fire extinguishants, rather retardants).
They showed two mock up fires; one in a Conex shipping container, and one in a fully engulfed automobile and in both cases the fires were out within less than five seconds.
If I wasn't brain dead I would figure out how to post it on You Tube. Bob