Now I have some experience of adding tags to episodes, I'm surprised by how difficult I often find it. For example, I'm very unclear as to the distinction between Global and Real. It seems to me that we don't really need both tags, but I suppose that now that both have been added to many episodes it's not really possible to remove one of them.
I feel similarly about Ident and Status.
Another question is whether tags like Be should apply only to the episodes where the actual growth occurs or also in episodes where someone features who has previously grown. That's handled explicitly for transgendering, but not for anything else. Fortunately it's not an issue for Pr, as that's something that's continuous rather than a step change.
Well, Global and Real are different things. Global refers to changes that effect the whole world (or possibly everyone in a town or other area). Such as "All women have large breasts". Real refers to reality changes, usually in the sense of "reality adjusts to reflect the change". Such as everyone thinking a certain character has always been a girl.
Ident means that a person has a new identity -- which now that I think about it, is also a "Real" change. Such as Jim becoming Sharon's son instead of her boyfriend. Status... well I never really "got" that but it's about "social status" changes, such as Sharon becoming a cheerleader or a maid. I asked if that was more of a "cliche" change, but the person requesting it disagreed.
I agree that the issue with the "be" tag is debatable. Many tags that relate to a Transformation could be split in two like the tg tag was, but then the tag list would become a LOT longer and harder to use. I've debated about adding a "big breasts" tag to compensate, but that seems unfair to the other tags.
It actually is an issue for the "pr" tag too, because some people fetishize only the growth aspect, and don't care as much about episodes where the character is already pregnant. So I don't know what the right answer is there.