If you are looking to manage when employees can take time off, say 2 weeks from now or further out, read more here on how to do it.
How can I let managers approve absences during black out periods?
TimeWellScheduled allows you to manage the OT rules at a global level, as well at the employee level. Read here on how to manage it.
User defined fields allow you to record employee details that are not pre-defined in the system. They can be things like allergies or license plate. To find out more, click here.