If a question presents an understanding, and specifically requests an alternative, should the question be tagged as relating to the provided understanding? For example, should this be a tanya question?
I think that the answer to the first question is yes - if the other source is a necessary part of answering the question, even though the answer sought is specifically not that source, then the question is related to that source. Someone interested in Tanya may be interested in seeing that question which asks for a different perspective than the Tanya.
Regarding the second question, I'm on the fence. On the one hand, the question remains the same if you would take out the author's suggested location for an answer. On the other hand, someone looking to answer questions about Nefesh HaChaim may be interested to find that question.
I think that the first question should not be tagged tanya. The question isn't about Tanya; it just mentions it. Questions should be tagged with what they are about, not what they contain. There's an MSO or MSE guide about this somewhere, but i can't find it right now.
I agree with YEZ about the second question - undecided.