Great topic... man I haven't had a real team training session in about 8 years. What is your training area like? Ideally you have a diverse training area with woods, field, streets, yards, and buildings.
You should fight using specific scenarios designed to increase your team's ability at certain things. I will give you a few that I recommend:Evasion
Objective: to develop stealth and to develop tracking/hunting skills.
Split your team in half. Give team A the lower powered guns. Give team B, the hunters, the higher powered guns. Give team A a set amount of time to get from one point to another without getting out. If you get hit once you are out. Team B, the hunters, are allowed to leave 1 man back to guard the end point, but everyone else has to stay a certain distance from it until the enemy has been spotted. This forces team B to go "hunting" for team A, since they can't base camp. Since A has inferior weaponry, they need to rely more on stealth.
Use these hand signals
to be more stealthy. I plan to take pictures of myself demonstrating these hand signals, and updating that page when I get home. In the mean time you can see what they look like here
Objective: Become skilled at using ambushes and defending against them
Again, split the team in half, but this time keep the weapons equal. Team A must reach a certain point in a given amount of time. Confine their area of movement (ie they are only allowed to move on 1 or 2 paths). Team B plots an ambush, or multiple ambushes along the way. Again, if you are hit you are out. http://hydrowar.com/ambushes.html
Play the above scenarios with 1hk because it increases your reliance on tactics, stealth etc, and once you develop those skills they will make you a superior player/team even if you are having a soakfest.
I also recommend making up attack/defend scenarios and capture the flag scenarios. These are best practiced as 1 hit scores or just simple respawn with no one winning until a flag is captured.
You should also have 1 on 1 soakfest matches with everyone watching, I think this was mentioned by other people. This should develop players dodging skills, their timing, and their rushing.... unless players end up going toe to toe and firing at point blank range, in which case you'll need to split them up. For players of superior talent, give them a smaller or less powerful weapon when taking on opponents.