One thing I realised was that if they (tags) were to be placed as sub-categories, which parent would they be in? Both Support and Bug Tracking seem likely to have these (and having identically-named subcategories for different categories would just be plain confusing).
One thing I noticed was that the navigation links to ‘Report a Bug’ or ‘Give your Suggestion’ redirect to the category page. Would it be better to instead open up the composer directly with the category filled in? You could use Creating a link to start a new topic with pre-filled information.