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That is, if a question is about a particular LaTeX package, or the accepted answer is, should that question be tagged with the package name as tag? I think this could be a good habit.
Yes, but IMO only if the question is also tagged with the appropriate tags for what the package does (i.e., [graphics]) so that you can find it in a search (i.e., so you wouldn't have to know the name of the package to find the question).
yep (15 chars padding)