Well, this is slightly off topic -- but since the OP got his question answered, and this IS a WB question -- I'll ask it here.
How do you get around the jungle/grassland/plains bug? By this I mean that the WB only lets you place jungle on grassland, not plains. Because of this, any maps you create will have more food than a 'true' game (Jungle tiles will give 3 food instead of 2, jungle banana gives 4 instead of 3, etc).
I love making maps, but it kind of defeats the purpose when you can't make 'standard' maps. This bug has been around for a LONG time (since vanilla, IIRC); and I have always been curious how other would-be map makers handle this.