Re: Killing the @mention function
Why not just leave it on the notification page? So far, you haven’t removed the functionality. You’ve just removed the navigation to see some of that functionality. So, if someone does the @username they’re going to get a notification unless you disable that also. Plus, not many people are going to look at the notifications page anyway;-)
To your question, I think you would have to remove the action and write another function that doesn’t display the mentions settings. You’d just need to test what happens when save is clicked and that setting isn’t passed. Maybe you pass it as a hidden variable or something.