I assume this is outdoor? So you can't do staged lighting ( low light, bright light, disco bulb effects) ? Those are always good scenarios to train with.
The course at Valhalla ( before it closed down *tear* ) was awesome. They had barricades you had to move to, targets at different heights, doors you could actually kick open and clear a room, hostage scenarios, lighting scenarios, a fog machine, pop up targets - all sorts of stuff.
Movement through cooridors should definitely be taught, as well as not to "sweep" any other person with your weapon.
Is it one at a time? Or are you doing team training?
Ballons are cheap and they blow with the breeze to simulate movement - always a favorite because they are a reactionary target.
Definitely should have some crouch positions, like a couple of 55 gallon drums to "hide" behind and practice shooting from a kneeling position. Including a tactical reload while in an uncomfortable position would be good as well.
Do you have any pavement on the range. A cop buddy of mine taught me a hell of a trick with "skipping" shot under a car from about 20 to 30 feet. Works great if a guy is taking cover behind a car and using the roof to steady his aim.
Doesn't do the car any good, but you could build a mock up and have a plywood and steel plate bottom & you don't have to worry about the movie style explosion.
Interesting BKT - I would love to see some pictures when you guys are done!!