I say use real people volunteering as victims wherever you can. Get them to 'play dead' or be unconscious if they are happy to do that. This makes it so much more real for rescues, and crews are forced to think about handling, keeping their airway open, and they bend like real humans do (lol....duh).
I find that crews get used to 'pulling out dummies' at training and they tend to forget about first aid after removal, cos it was only ever a dummy.
Train how we play as much as we can. You can make it a toxic environment as in CO or something, then there is no smoke but it may be quite dark if possible?
Just some more thoughts