Thanks Steve, interesting.
I like that idea of warming subs up properly.
And I like the idea of changing the terminology from "substitute if someone gets injured or is crap or knackered" to something more like:
--- "finisher" for the attacking roles and ensuring they get 25 minutes to finish off the opponent, this is a specialist role to be coveted i.e. you don't need to do all the running about and tiring them out, we want you to come on against a tired defence and when the game has opened up a bit and do your specialist finishing skill
--- "shutouts" for the defending roles i.e. when we are in the lead with 30 minutes to go you will be brought on to close out the game, waste time, shut down the opposition, niggle, waste, fall over, block and defend. Again, a specialist skill, not just "Dave, you aren't as good as Sergio, so you can't play today, go and sit over there for 88 minutes"