Tom Thumb - you are half way there with the way it despatches.
Auriga's DOS system despatches every second - this means that a job can be despatched to a vehicle inappropriately - imagine the job can be done by any car, is given to a 5 seater - then 5 seconds later, a 5 seater job comes in. Lots of juggling to get the normal job back so you can give the 5 seater job to the 5 seater.
Evocab uses a (default) 15 second despatch cycle. During these 15 seconds, the system is gathering more information - more vehicles going soon to clear, going free, more jobs coming up for despatch now etc, meaning it can base it's despatch decision on a longer period of time - hence - making it more intelligent.
15 seconds is the default - there is no reason why it could not be set to 30 seconds - the only problem with that would be that drivers would feel the system is going even slower - which it is, but it is making even better decisions.
The point regarding a job essentially having a variable despatch time based upon the vehicles around is a difficult one for any system to do. My understanding with it at the moment is that is uses the delay times for zones, based upon the companies opinion on how long it normally takes to cover the job. These delay times can be extended for specific vehicles, so you could, for example add an extra 5 minutes to the standard delay time for a 5 seater job - but of course, this is not what you mean.
What would be good (i agree

) would be for the system to know (for example) a car is dropping at the airport soon, if they hang around for x minutes, they can be automatically given the return. This sort of thing may be available at some point - I understand their new data units will show you jobcounts for jobs coming up in the future. Even though it means the driver would still have to look, then ask the office for the job, at least it should mean less running past other cars etc, when you were the most appropriate car just a few minutes ago!
Finally, trust me when I say I am not trying to give you the sales pitch. I am simply trying to give the facts as they are, and assist anyone with questions, queries or issues with the system a route to trying to sort it out - you will find many of my replies to comments have advised posters to speak to their office - as many of the issues can be resolved via them.
Happy Christmas everybody
