Scenario:
Web TimeSheet users are working at remote location with limited access to internet because of which they need to use offline timesheet for entering time and time off. Using offline timesheet we can enter time and add time off but we do not have an option book time off.
 
Workaround:
Disable the Booking required option from the time off types and enable the Enter time against time off types not requiring booking option in the permission assigned to the users.