Custom User / Employee Reminders

It would be really useful if we could have employee / user created reminders - potentially included within the pay run warnings. There are many different scenarios in which this could be used. For example: We have been asked to increase an employee's pension contribution percentage for 6 months, we currently have to make a note of this and remember to revert the percentage back. It would be very useful if we could have a user created reminder within the payroll on a certain date in which we would be reminded to revert the pension percentage back to the original.