Requested feature overview description.
Finally decided to bring this up. The "recent tags" that comes up by default when you start editing are mostly useless unless you take advantage of how it works. The problem is that it's way too short and shows tags already in place leaving little to no room for new ones.
Another neat feature would be a new "related tags" option (what's the proper word here?). One that would show all the tags from the previous page you saw or edited that isn't in the post you're currently editing.
Why would it be useful?
This would be useful because it would save a lot of time tagging multiple posts. Especially when you're tagging related posts such as comics or when you're are hunting specific missing tags. If the recent tags only showed tags you previously entered it would be more effective. Even more so if it remembered tags from several edited posts. It's possible there might be a easy fix coding wise. The current "recent tags" show the tags from the last post you edited from top to bottom. If the tags you submitted are written in the beginning of the text box it passes on to the next post you edit. Unfortunately the tags you click in are pasted at the end so they aren't passed to your next edit. I circumvent this by opening several post tabs so I can submit the same tags to multiple posts efficiently.
The fix I had in mind is if the site would paste the tags you click to the beginning of the tag edit box, effectively making the recent tags your recent tags.
What part(s) of the site page(s) are affected?
As far as I know only the tag edit would be affected.
Updated