>>3258
Not right now. I'd like to have ratings actions in the next overhaul of the downloader engine, so people will be able to set ratings based on parsing 'questionable' and so on. It'll be easier to set up synchronous ratings and tags at that point.
For now, you'll have to do it manually by searching for the tag/rating and applying to a select-all of the results.
Note that you can search for rating using system:rating, so you may not need the tags if that's what you are looking for.