Sankaku Channel/

Also, "Name (ja)" in the Tags section remains uneditable for a while now.

Pretty sure it’s editable, just doesn’t show up as soon as you do because it requires staff approval.

I also wanted to bring up the point that the copyright category is too generalized in my opinion, and that it should be split; I’m not sure whether I 100% agree with your way of splitting it, though. About the last type you propose, I don’t think I ever encountered such tags, so my opinion is neutral.