Darn this was spammed over night. To the question about what would happen if while a member has that tech active he's targeted by a Gen, the answer is simple. F-Rank Gen would dispel the "mode" and S-Rank and below would work like they normally do.
Double casting Genjutsu or casting multiple genjutsu works. However, what people tend to understand by double and multi layered gen is a technique, a genjutsu, that produces a multi layered illusion. Dispelling the first, renders you caught in the second which you need to then dispel. Thats what will never be approved and isn't possible and that's what people tried to submit before. Multi layered doesn't exist. Multiple simultaneous illusions yes. Those are possible. However, releasing from one, releases from the other as they are both working at the same time.
Casting a Genjutsu upon another genjutsu can work but only when the illusions are compatible and there isn't an overpowering issue.
Example:
-I cast a C-Rank illusion making you see butterflies then try to cast a B-Rank illusion that makes you see eagles floating around.
The moment i cast the B-Rank illusion, i'm overpowering the C-Rank one and dispelling it. If it was the B-rank first, then the C-rank ok, he'd be left seeing butterflies and eagles.
However, this is were it gets tricky. Imagine that I use a gen, A-Rank, that makes him experience torturing visions of death. Then I cast a B-Rank soothing illusion that would end up making him sleep. Whould it be possible? No. Both illusions aren't compatible. As in what you are making the enemy experience isn't in any way compatible.
Bottom line is that you'll need to be sure that the illusions you are casting upon eachother would "work" or "function". Otherwise it won't be possible.
The only moment so far where we saw a double layer genjutsu was the use of False Surrounding, creating a denser illusion. It was like casting it twice to make the effects stronger and more detailed. Creating instead of a simple alteration of the surroudings, a more labyrinthian illusion. Its like taking it to another step.
As for the rest of this issue, Caliburn said it all. We are able to revoke things and re-check things and edit things once they are approved. However, we don't do it lightly or just because one issue happened. Its not a light hearted decision and I'm sure everyone understands.
As for NB Gen, I talked to Caliburn and he'll reevaluate it to be sure its reasonable since apparently more complaints were issued about it other than migs. In the end it might even be declined or removed for good. We'll see.
Regarding this thread, I'm closing it. The main point came across and the main issues were approached. Some heated comments (mine included, and I'm sorry to mig for them) have been exchanged but nothing more can be gained from this other than spamming and insulting eachother.