There is no such things as "dogfight" and "coop" in CloD, only general "online" simulating real life (because you do not have separate dogfight and coop in real life). Dogfight and coop separation was a limitation of the original IL-2 engine.
If you want to limit yourself to the classic original Il-2 style coop just create an online map with both bots and spawnpoints. Then in the beginning of the mission spawn whatever planes you want and go ahead escorting/intercepting bombers or attacking ground targets depending on what you scripted bots to do.
Probably you mean lack of coop-style missions when yo say coop is not available. Just create your own missions with bots and spawn-points as I mentioned above. FMB and unlimited C# scripting possibilities are there for you.
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