Hello Trululu Gumdrops,
Thank you for your questions. At TibiaQA, we aim to be completely open and transparent, and invite other users like you to help us moderate the content on the site. For this reason, we don't have any additional internal guidelines. We expect site moderators and the community to rely on both the Help Center and the Meta TibiaQA to make the best decisions. If you feel some areas aren't explained well enough, let us know - we will see if we can improve those guides.
The ability to see who moderated a post at the Moderation Center is available only to moderators. Is there a reason you think this information would be helpful?
Mass moderating the tags is possible, but we don't plan on opening that possibility to all users, to avoid a mess. I admit we also don't have precise guidelines for tagging. Nevertheless, some obvious cases require moderation, like typos or duplicates (e.g. singular and plural versions of the same thing). Mass changes to tags can be requested via Meta TibiaQA - just make a post, provide a reasoning, and if we agree, we will apply the changes. We might even award some bonus reputation points on TibiaQA where appropriate, to recognize helpful contributions.
Hope this helps!