Please don't consider the salary slab as it's clearly mentioned, "Managers and persons working as supervisors drawing a salary above Rs. 3500 p.m.," i.e., persons at the manager and supervisor levels are only exempted from LWF. Whereas, you have to pay LWF for normal employees at Rs. 12 (employee) and Rs. 36 (employer).
If you see, the minimum wages for Maharashtra itself are more than Rs. 5000. In that case, none of the employees is liable for LWF if you accept Mr. Shenbagarajan's view. So, please seek clarification from the MLWF board and pay the LWF to applicable employees (who are not in managerial or supervisory positions). The last date for payment is 15th Jan '12.
Regards,
Ram.