Most (and I say this without hesitation) owners of v5 UBB's in the next few months will be pirated warez scripts. We are seeing this already, which is one reason MM is ready to discontinue support for v5.
Regardless of what we think, every line of code in any version of ubb is copyrighted, they can do exactly as they please with it. None of it is "open source".
These 2 statements are what tells me IP will not allow a modification site for v5. V6 maybe, but not v5.
Can anybody can produce a license that says they can distribute modifications for the UBB without permission from IP?