1. I think you better ask SOCSO whether the SOCSO money should go to the employer since the employee had been paid normal salary.
2. Section 60F of the EA may help to answer your question:
"(4) No employee shall be entitled to paid sick leave for the period during which the employee is entitled to maternity allowance under Part IX, or for any period during which he is receiving any compensation for disablement under the Workmen's Compensation Act, 1952, or any periodical payments for temporary disablement under the Employees Social Security Act, 1969."
3. Some employers will advance money during the period of disablement in order to help the worker to tide over financial difficulties while some not so caring employers will not do that. Ask COCSO what is the best out.