Hiding buttons in game controllers menu

Hi!

I am completely new to Arduino, but I want to do a controller with 3 buttons. I succeed by using SimHub Arduino Configurator, everything works perfect, but I wonder if it's possible to hide excess amount of buttons? I mean, in game controllers menu or Content Manager you see the device and it has 20 buttons, but my controller is using only 3 of them. It is just looks ugly when you have custom button box, wheel, handbrake, SKRS and sequential, and every one of them have 20 buttons which is not used (apart from button box of course). I know that SimHub have some better featuers after buying the license, but I don't see if hiding excess buttons is one of them. I reckon it is possible by writing my own library and sketch in Arduino IDE, but what I see in the code is harder than cyrylic, kanji or arabic...

Sorry for my English, I know it's not perfect but I hope you understand!