I am on a 1 pump R/T station with 9 FF, 2 LFF and a Station Officer, 12 potential riders!, more than half of these guys (and girls) provide full cover (myself being one of them).
I live and work about 200yds away from the station so I can catch every single shout if I need to.
We operate a weekend duty crew system that 90% of the time works perfectly well, each of the Lff's has a crew, one of 5 and one of 6, which cover alternate weekends from 1200H on a sat. till 0000H on a monday, with the crew of 5 the first 'offduty' member to turn in gets to ride, the Station Officer can attend onthe the pump if the full crew has not turned in, if there is a full crew he can follow in the Landrover if it is Persons Reported or Trapped etc!. No Lff or above is allowed to drive a pump on blue lights full stop in our brigade which would solve Specks problem, this does seem to have flaws though because it means that one of our Lff's who is a professional driver isn't allowed to drive the appliance even if the Stn O is in charge, the argument is that his skills and experience as an Lff can be put to much better use than working as a pump operator/ driver for which other crew members may be available for!, the other side to that is how can a FF gain the experience and knowledge the Lff has if the FF's always having to drive and let the Lff go BA!
The Duty crew system falls down when it is not used properly, the theory works well but it has to have the full backing of everyone who uses it!, it fails (or at least doesn't work as it should rather than fails because the end result of the pump rolling out the door hasn't failed for as long as I can remember!!) it fails when either someone who is on duty has 'forgotten' it's thier weekend and either turns out too slowly or not atall or worse when one of the duty crew is unavailiable, for example is going out on saturday night, this can be avoided by asking one ofthe non duty to cover!
When it works it works very well, I think it is important for some sort of shift system to be in place because as has been said already never getting a turn out is not good for morale and causes people to not bother to rush down thinking that they will miss it anyway or worse still leave, leading to the problems mentioned above. It is important that everyone gets a fair crack at the whip to maintain both morale and skill levels, we had a (very slightly) delayed turn out a few weeks ago when by coincidence one night at about 11.30pm three of the closet living FF's were unavailiable and a shout came in, the remaining crew members all casually came down to the station fully expecting not to see the pump and were actually genuinely surprised to catch it!.
Another way to do it speaking as someone who as I said at the beggining could catch every shout is to give your seat up, obvioulsy I always turn in as quickly as I can and get myself ready as quickly as I can, if however the seventh person to turn in is one of the poor sods who always misses it why not stand down and let him go occasionally?, it doesn't affect the turn out time.
Specks, whatever you do it must be fully supported by everyone or it simply won't work, good luck and stick with it mate!