Upon retirement, an employee can draw a lump sum (by whatever name called) from the balance standing to the credit of his/her RSA provided the balance after the withdrawal could provide an annuity or fund monthly payments that would not be less than 50% of his monthly pay as at the date of his retirement.
However, an employer may choose to pay any other severance benefits (by whatever name called) over and above the retirement benefits payable to the employee subject to the terms and conditions of his employment.