Mates, please don't start paranoid control discussions.
SAS and UP are kinda Dollhouse of IL-2, don't tell people they'd have to become catholic to get in.
I can't tell you precisely what the original intentions were the lead to the conclusion not to include DiffFM with UP3 RC, but to me it seemed to be a wise decision for one single fact already which I personally appreciate the most in terms of not having had DiffFM in yet:
Less cluttered support.
Like it or don't, but there are stupid claims and request coming around frequently, and it's already hard enough to keep up with the threads and separate the real issues from the nasty bogus claims.
Adding the ability to put WIP projects in doesn't make life easier for those who want to help others in case of trouble for sure. Please keep in mind that this is a Release Candidate and nobody ever said there won't be a DiffFM for it later.
Anyway, now there is one available (see: It's not that tricky so it was quite likely someone would take the task) and we (the supporting bitches) have to deal with it.
I just cross my fingers that there won't be several dozens of "requests" with completely fubar'd installations behind, with the user claiming "of course" to have just a plain vanilla UP3 RC installation.
That's what makes life hard gents, when you try to help out someone and after two weeks on a sidenote you get to know that the answer to the very first question was wrong already and all the work and efforts you put in went to the trashbin.
Best regards - Mike