Ability to make payroll categories "inactive" to not show in "Timesheets" dropdown box

I urgently need this to be made possible.  While I realise payroll categories are not actually able to be deleted once used, or an employee cannot have their "tick" removed from the category also once it has been used, you urgently need to have a box next to each category for each employee so that it is able to be made "inactive".  That way when I go to process their weekly times in "Timesheets", that payroll category does not show up for that person.  We are not a standard base hours, t1/2, double time set up, many employees have individual pay categories and long story short - my payroll categories window has a huge amount of different lines.  When an employee goes from one category to another, it can get very confusing in Timesheets when I accidentally click on an old category and then its an issue having to fix it later.  Please, please, PLEASE, make this system more user friendly.  Make each person able to have old payroll categories made "inactive" for them specifically, so that only their current active payroll categories show in Timesheets.