Sorry about that I gave advice on an assumption
it looks like to do what you want you will have to edit some config files for the mint menu which unfortunately I don't now anything about
although it's probably something in this folder which you'd need to edit maybe in the sub folder called "plugins"?
Although I think this is probably a question for Husse or a developer
maybe you should send a Private Message and ask... I also think this should be a recommendation so you can edit that part of the menu from a GUI
(As I cant see an option for it if you can already?)