Custom Fields and Custom Reports

1
  1. Could I add custom field in Recurring Payslips?
  2. Could I have a list of tables and columns name, and also how my custom fields be named, to create a custom report with query?
  3. Will there be any feature for user access matrix per data in module, for example I do not want my HRD staff reads all employees’ payslips?
  4. Will there be any feature to perform one payment for all payslips at a time?
    Thank you.