Alarm and Response ‘completion’ regulations

This is something I can already see being so helpful. Essentially, at the moment we only have the ability to create Alarm and response regulations (ARRs) that just add vehicles to a mission. But, what would be even better is an option to create ARRs that have a set number of vehicles, and when clicked, just add the vehicles that are missing from that completed regulation, whilst taking into account the vehicles already on scene/en-route. Situations I can see this being used in are fires that receive more alarms following the initial attendance. In which some vehicles are already present, but more are required to ‘make up’ the ARR. A ‘fill in the gaps’ sort of thing. I hope this makes sense. Thank you