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That's a really great idea ecib. If you're at the point where you are leaving a comment, you are hopefully familiar enough with the post to add a tag. Great idea, I would likely add more community tags if this were an option.
From a philosophical standpoint, I could see removing the community tag option from the main feed completely, with the reasoning being that the only people you want to tag a post are the ones engaged and informed enough to move to the discussion page. It would remove a small (though always significant) bit of clutter elsewhere to arguably improve community tag quality. Not sure that it would be necessary, but it is certainly a thought. Lack of visual clutter is a premium as far as I'm concerned.