Yes, the GDW (Glass Damage Waiver) can be added at the MCO Branch. This is relatively new at this location and it is not currently bookable as an option on the Internet. Here are the current Terms and Conditions regarding the GDW:

Glass Damage Waiver (GDW)

Glass Damage Waiver waives your responsibility in the event of damages to the windshield, side windows, rear-window or mirror glass.
The cost of GDW is $14.99/rental (plus local tax).
If GDW is not accepted, the customer will be held liable for the full value of damages to the windshield, side windows, rear-window or mirror glass.
If GDW is accepted, the customer is only responsible for the following amount: $ 0.00.
(Glass Damage Waiver = GT)