Aircraft Fires. A Good topic particularly for those who have already had one and for those who might be concerned.
Having had one engine fire resulting in a need for a wing change and several false fire warnings I believe the biggest problem is initially knowing whether you have a real fire and then its extent. There just aren't enough clues available to the crews to assess a fire event adequately leading to optimum actions for fire suppression/extinguishment.
Now that miniature high resolution video cameras are available at low cost we can all come up with numerous locations from which we could easily have presented a monitor view of the primary areas of interest. Throw in a bunch of temperature sensors in vital locations, other than those already in place, and we could then have the means of either dealing with an airborne fire or taking the most appropriate actions. Some of those action could even be automatic.
Tis a subject that has been neglected for too long.