I'll be of the dissention opinion here then. Please give us a mission builder with which we can do anything that's possible in the game engine, without limits. In other words, a mission editor that has people's knowledge and preparedness to lean as its limiting factor, rather than ease of use.
Popular campaigns like Gambit's Hell Hawks Over the Bulge, the many free ones of Jaegermeister, or even my own Hürtgenwald campaign wouldn't have been possible with a mission editor that doesn't expose the many options that exist in IL2. Versatility and ease of use for the uninitiated public are two aspects that are generally very hard or even downright impossible to combine, so if a choice needs to be made, please choose for versatility rather than ease of use as it will tremendously increase the quality of user-made missions and campaigns (rather than the quantity, which an easier mission editor tends to do).
Of course, if it's possible to make a small, easy to use in-game mission editor like the one in IL2 1946, that's perfect too, as long as there is at least the possibility to use a "complete" mission editor.