The food cap often means the farmer won't harvest their crop which is specifically required for the brewery. Increasing the cap means other food production takes the space up again over time and reaches the cap again. I also find the population buying the crops as normal food when I wanted to keep those crops only for brewing. These problems result in the brewery constantly running out of supplies.

I would like to see a mod that allows you to specifically allocate the crop for the exclusive use of the brewery so it doesn't count toward the food supply. The harvest from the farm also doesn't get bought up by the population since it's not for sale as food.

Even if it adds another class "Brewing supplies", which has its own cap.

Not sure if it's possible but I have seen Charcoal added as a replacement for coal so I presume adding a new class of supplies would be the same.