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You can already add multiple tags to a question.

1 Answer

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Admin>Posting>Maximum number of tags: (Choose how many tags you want)
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how can only the admin can add extra tags for all questions
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+1
The Tagging Tools plugin < https://github.com/svivian/q2a-tagging-tools > has an option to allow the creation of new tags only for users with a given minimum number of points. In order to allow creation of new tags only for admins you'd have to either patch that plugin or write a new one.
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ok thank you
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