You can bypass the 4 Foodtype limit and make it possible for your City to have all 8 in your Granary!
First four foodtypes you can produce in your City or trade them from your allies, like normal.
The remaining four can only come via Tributes from your Vassals - Zeus Editor checks every place *except* the Tribute window when it comes to the food limit.
For example, City A can sell you Fish, Meat, Cheese and Urchins, while Cities B, C, D and E can tribute you Carrots, Onions, Wheat and Oranges! All 8 will show up in Granary with fully adjustable get/empty options.
Unfortunately, there is terrible bug associated with this bypass: Your Food Vendors won't pick up the extra 4 foodtypes because the basket lady will walk up to Granary, disappear as if Granary was empty, then the agora will send another lady, and so on, till your people start to starve.
You can, however, have 4 Foodtypes in Granary + Wheat in Warehouses for your Horse Ranches; food vendors will pick up the 4 foodstuffs while warehouse cartpushers will deliver Wheat for your Horses without problems (you gotta micromanage the wheat away from your granaries, though).
THEY AREN'T DIFFERENT AT ALL!
They all work like the top one (as in: you fulfill the request, next event triggers within specified time frame).
I guess the makers of Zeus editor wanted to expand on the possibilities but forgot/didn't bother to properly program these options (and that's sad).
[This message has been edited by Haspen (edited 10-05-2016 @ 05:20 PM).]