It is quite unfortunate there is no Rice in the list... Rice was very important for colonies (at least in 13 colonies), almost as important as Sugar and Tobacco...
Well, Rice could be unique: you can sell it like a Silver (it is not very boring, since every other yield has production line so here is some variety) AND you can drug Rice to the Food sector and "cash" it as a Food! But I am not sure if this can be done in DLL...