I am by no means the last word on this (or the expert, or the old timer), but this is how I thinks Dueling should go down. Please add to this or suggest changes that you see necessary.
1. Same Plane, Same load out-this involves fuel, guns, even ords if you choose.
2. An Alt cap until first merge should be agreed upon before in the air-example: alt cap is 5k, then no climbing above 5k until visual -------confirmation.
3. Roll from runway at same time-this is just to keep weight from fuel as close to equal as possible.
4. No HO's-some would say only no HO's on first pass, but no HO's period leads to longer, betters fights.
-------What is a HO: A shot is considered head on if both pilots have a gun solution. As a rule, when in doubt, don't fire.
5. No External views-No viewing from F3 mode.
6. Once a visual is achieved, acknowledge it on text. When both pilots acknowledge a visual, feel free to dive, or climb if you like. If -------both pilots do not acknowledge visual, then both pilots separate and try again.
7. Extending should be limited to 30 seconds (stole this from KOTH rules)- A pilot may extend, but after 30 seconds it is considered -------running and should result in a forfeit.
Hmm, there is a lot more that could be added here but i would have to think for a bit. feel free to add.