In my modest opinion, I think the best practice is that an add-on does not override a built-in shortcut. I’d ask to change the shortcut key to the author’s add-on. I have seen couple of times authors updating their add-ons just to change that when they weren’t awere of the conflict and a user reported the issue.
I think I cannot change the category to add-ons. I need to get familiar with Discourse yet.