Free shipping for multiple geo zone

Hi,

In "Extentions > Free Shipping" can only choose one geo zone, but I wish to choose multiple.

Any solution?

ps/ opencart version 1.5.6

My Multi Flat Rate Shipping can set multiple flat rates (including 0.00 cost ones) for different geo zones. If you need something more powerful, take a look at Formula-Based Shipping, which can base rates on total, quantity, postcode, weight, volume, geo zone, store, currency, and customer group.