This makes sense, and i see the similarity to the "report abuse" suggestion. Sort of "abuse" vs "misuse".
Seems like this problem would cover all author-decided items: tags (as you stated), maturity, difficulty. So, it'd be a little limiting to keep it to tags.
"Report Abuse" sounds like it'd be only for below-minimum storygames (porn games, for example), so what if we have a "Flag" function. And then it'd be like, "Flag for miscategorization", or whatever... and then you type in a message.
In any case, building a new system to manage these flags/reports/etc would be a pain, so for simplicity I guess it could post a message to a hidden forum... then mods could repsond and be like "done", or "what do you think, is it a problem?'. Etc.