I think the parent comment is suggesting something like, in a new version of the software, doing this: -- remove the button for the feature, replace it with a

I think the parent comment is suggesting something like, in a new version of the software, doing this: -- remove the button for the feature, replace it with a "Give me back my feature!" button -- when the "give me back my feature!" button is clicked, send a GET request to mydomain.com/theywantedthefeatureback.php , and give them back the feature button -- look at your server logs to determine whether anyone actually uses the feature This is no big hassle for the developer or the user and it will tell you rather quickly whether anyone actually uses feature X.