Ragers won't stand a chance, people won't follow their orders. People who are likely to be commanders are people who players want to follow. It is very clear to all that this is voluntary.
A quick guide for people who want to command:
1. Be popular among other players
2. Be known as a smart person
3. Make simple strategies that work
More complicated strategies will only be viable when people are used to using tactics, and actually sees results. And then only from leaders with great W:L ratios and trust.
Also, don't imagine it would be like: Go there and stand there, do this or do that. It's all about having a simple plan and making players understand it.
I think mission-type orders would be more successful like this:
Commander Gurni: "Oberyn, lead our cav and backstab their archers."
Commander Gurni: "Infantry, we plan to charge at 4 minutes, if they charge before us, do a countercharge when they reach the tree"
Commander Gurni: "Ranged focus down their pikers! Rufio protect our archers from cav and ninjas!"
Commander Gurni: "Good luck lads!"
Aka.. He trusts Oberyn would lead the cav well. Infantry knows what to do. Archers understand who to focus. He puts Rufio doing something he normally does anyway.