Suppress category from new topics

We have a category, which creates lots of new topic because of embedding (topics are automatically created when a page with embedded Discussion is shown).
Projects in Copr - Fedora Discussion
People are asking that this category should be suppressed from New topic. It can be suppressed form latest, but not from new. It would be nice to have a checkbox with “Suppress category from new topics”. (and RSS feed).

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I suggest you should mute that category for all existing users.