I got litle understanding of CFS/MFS/SES responses, but why isnt there a system set up like SAAS. Where each truck is a specific crew and a specific crew gets paged for a job/case, and if the incident is big enough (or requires it) additional crews get responded. Surley you don't need an MFS truck and 2 CFS trucks at a MVA plus SES. I have seen many incidents where only one fire (or rescue) crew is required and half the service has turned out.
Surley the boys and girls in charge need to sit down with each other (CFS/MFS/SES) and work out who has what toys (eg, fire, RCR, Storm, Land Search etc) and implement a plan of response for each area/catchment and to get rid of all the confussion, so 10 trucks don't roll out to a cat up a tree and 1 truck to an industrial fire.
Surley your comms can page, 1 crew required for MVA spillage, and the first 4 to turn out, go out the door and the rest go back home or to work, or you can have a running sheet of Joe, Bob, Bill and Jack are crew 1 (fire) and John, Billybob, Mike and Tom are crew 2 (Rescue) and you do this for the whole week on a day to day or 0800-1800 & 1800-0800 basis.
And if you get paged, you phone in, say "I on way to station" and if a crew is not filled, then comms revert to the next closest resource, page them, and if in the meantime your crew gets a full crew then the other resource gets called off. It can not be too hard, just needs a little give and take and some people to realise the can't save the world on their own by attending every incident and that their service is not better then the next.
If MFS take over Aldinga and Seaford as the community needs a full time crew due to the growing population base and they need reduced response times, so be it. CFS can back them up (if required) and be the primary response for grass/bushfires.
If this would not work, so be it, but seems logical and my view only. As the way I see it, SAFIRE have no idea what resources are where and how many resources they have at an incident.