At the moment, I think what we are lacking in is mission building. We rely heavily on what the 'Easy mission generator' produces. And in fact it is a very cool and useful utility, as it can and will create missions on the spot, so the host can steer on the number of seats needed, and the plane types, ie. add a Spit VB on the Rheinland map for someone that does not own Bodenplatte.
The downside is the missions are 'limited' to certain goals and are all of the same setup: Land where you took off from. What is missing is the kind of custom missions we used to have with 1946, and in a limited sense/number for CloD. Not neccesarily hinting on the long Coops-run-as-Dogfight, but just some custom/signature stuff - yeah, stuka-attack-on-planes-taking-off and that shift fun good show stuff.
So, start building missions!
Alternatively, one could try and maybe go hunt for missions already created by someone else? Like a good DF map to add to the DF server, or good coops to add to the GoodCoops server ... Or maybe even more simple: Add stuff to the current DF missions, to tune them up a bit?