I think Biblical-Basis should stand on its own.
(Correct me if I'm wrong here.)
From what I understand, the issue of looking for something from a denominational perspective stems from the fact that we must, absolutely, keep the questions answerable, objectively, and definitively. We do not want our answers to devolve into a war of opinions where the most popular view "wins".
Asking "What do Catholics teach about Baptism by immersion", for example is objectively, definitively answerable. (I'm not sure exactly what the answer would be, but there is a definite answer that can be supported and backed up with actual Catholic doctrine.
That's the value of asking from a denominational perspective.
Now, when it comes to Biblical-Basis questions, take the following two questions:
- "Is keeping the Law necessary to make it to Heaven?"
- "Is there a Biblical basis for the belief that obedience to the Law is necessary for salvation?"
The first one is wide open to interpretation. It's a question of Truth (and we all know where I come in on those.)
The second one, however, is not a question of Truth. It's simply asking "Based on Scripture, can an argument be made for xxx". And the answer is "yes. An argument can be made." We could quote Matthew 7:21 and others.
Clearly, there is a Biblical Basis for such a belief. Likewise, there is a Biblical Basis for the polar opposite belief - that salvation is of Grace through faith, and not of works, lest any man should boast. (Ephesians 2:8-9)
The fact that there is a Biblical basis for the polar opposite view/doctrine does not invalidate the fact that there is a Biblical basis for the first.
From my perspective, the Biblical-Basis tag is meant for questions like this. To bring those questions that would be "Truthy" in line with the site standards. It's not equivalent to "Sola Scriptura". "Sola Scriptura" should be used for questions about the well-defined doctrine of Sola Scriptura. It's also not equivalent to Restorationism. Restorationism is about a doctrinal framework based on Sola Scriptura. This is different.
Biblical-Basis questions can be used to guide participants to phrase their questions in such a way that meet the site guidelines without referencing a specific denominational viewpoint, or doctrinal explanation.
IMNSHO, the Biblical-Basis tag should remain as a separate, distinct tag for this purpose. It has value on the same level as the denominational tags.