I have been playing these games since the old Operations Flashpoint Elite days and the editor has remained roughly the same. I'm not new to the basics of the editor and have made countless missions through the years.
My problem here, however, is that any time I want to try something new or experiment with a module, etc., I have to scour the internet praying that someone has a detailed enough guide on how to use a certain module, feature, script, etc.
I would like to see in-game tutorials about the basics and the very advanced features of the editor. Every module in the game should have at least a basic intro explaining what each option means, and how to properly set up the module.
This kind of feature would greatly increase the amount of players making missions, and thus greatly increase the diversity and variety of missions and available lobbies to join. And that would keep the community larger and richer for a very long time.