Most of the groups in Toxia are little more than gangs. There is no real organization. One or two people may be in charge and most people in the group respect their decisions. Other people in the group may have a good deal of respect too.
This is fine for internal matters. Problems get dealt with fairly efficiently. On the streets its a different matter. In a given group there are a wide range of people with different skills and weapons that rarely if ever work well as a team as they lack discipline.
For instance if you were making an attack on another group you would send experienced melee fighters to the front and provide covering fire from a mixture of MGs and hopefully heavy weapons and snipers too. Ideally the covering fire and sniper people barely move to make their fire more accurate. Better yet you would try to set up some sort of ambush, drawing the opposition into a situation where your group would have an overwhelming advantage.
This would mean that more exotic and heavier weapons would become more important. Not many people carry sniper rifles as you can't effectively use them in a typical combat situation. If you knew you had other members of your group were watching your back while you attempted to pick off targets they would become a lot more useful. The same goes for other heavy weapons such as grenade launchers and Harkonnen cannons.
Of course the sticking point is the rules of engagement. Would setting up an ambush be within the rules? I think if you sent some melee fighters to draw in the opposition it might be. There would be a warning from the melee fighters before they initiate combat. They would then withdraw to the prepared position.It is normally considered fair to back up your group so that covers the ambush.