Just look at Falcon 4.0
That sim has made it through 8 years by just a bunch of community members researching and tweaking everything to the right specs...We're talking hours upon hours of doing everything to scale.
actually, F4 code was "stolen" (other words may apply too) and the guys developing it now are good, but fix their own standards, independantly. they can have stuff right, or not, it's up to them to decide whether it's ok or not...
in a "open to all" scenario, you get more something like CFS in those "open rooms"...
as for adding something to the BoB, well, in IL2 oleg stated more than once they had to rework almost every plane added, with the level of detail in BoB, chances are that no "free built" plane will make it into the game... they'll need to make them with oleg's team to be up to the required level IMO
basically, you'll have two games in one: one game with all sorts fo add-ons, like CFS, where online will be same as for CFS, and another one with planeset where you'll know what you're up against
anyway, if we read whaqt oleg said, they plan to release some tools for ground objects and small maps, but for planes, they have yet to see if they can and will do it as intended...