(a) In lieu of payment of temporary income benefits under this subchapter, an employer may continue to pay the salary of an employee who sustains a compensable injury under a contractual obligation between the employer and employee, such as a collective bargaining agreement, written agreement, or policy.
(b) Salary continuation may include wage supplementation if:
(1) employer reimbursement is not sought from the carrier as provided by Section 408.127; and
(2) the supplementation does not affect the employee's eligibility for any future income benefits.