Removing payroll categories from employees

There seem to be a lot of posts requesting this. The response is to make the payroll category inactive. The issue we have is our employees change levels with each year of experience. As everyone has started at different times, they are all on different levels. We cannot make payroll categories inactive for one person as other people are using it or may use it in the future. Employees that have worked here for a number of years can have a long list of irrelevant payroll categories showing on their timesheet. Even if they could just be disabled from the timesheet screen. The ability to remove them would save time & ensure the correct category is used.