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Honestly, the ability to edit an additional tag or two on is not rare. Most board softwares allow for a few to be allowed to be tagged, including the big names like vBulletin. Often either the tags are not used or a helpful few add them on -- rarely are there any problems with those added, and they can be easily reported.
For the record, tag report systems already do exist for things like artwork, and posts with bad tags can be reported so that the tags can be altered. The only difference here is that we are adding on to the things that a post can be reported for. Personally, if someone is willing to do this they are probably going to post poor stuff anyways. Tracking tags is something I would not mind either.
Otherwise, this is really a zero harm issue in my own book. Most of the issues can be easily handled under existing paradigms.