To Severstal separate checkboxes, separately to pull up the plugin scrolling. The connection between them is no. Then a list of checkboxes to insert into scrollmouse panel.
How to customize checkboxes, easy to Google https://yandex.ru/search/?text=custom%20checkbox
Custom scroll also simple to find in Google. But I will recommend you to use https://github.com/Diokuz/baron
It turns out that the answer to the question is easy to Google
It was necessary to do so...
What prevents to use a search engine?