However, it is possible for users to write JS codes and configure their browser's static data of the site to add extra functionality. I'm not good at JS. If someone is then they are most welcome to make such changes.
This guy said he had made such scripts for some utility. I asked him once if he can make one for subscript/superscript. I guess he told me that he was busy at that time with some exams/interviews. You can ask him again.