This mod disables spoilage for spoilable items, but offers "Fermentation" recipes to spoil them manually, using the new Fermentation Plant structure. In other words, it's another spoilage-removing mod with a few extra tweaks and needlessly over-complicated back-end. Specifically, the mod does three things things:

• Remove spoilage: every Vanilla item which spoils no longer does. Yumako is as eternal as a lump of rock.
• Add "Fermentation" recipes in order to turn items into their previous spoilage results on demand, as those are needed for Gleba progression and that of some other mods.
• Add a Fermentation Plant (using Hurricane's Chemical Stager sprites), where Fermentation recipes can be crafted.

The mod offers the following four settings:

• Individual toggles for spoilage removal and marination. It means you can JUST remove spoilage or JUST add the Fermentation plant. Or neither, I suppose, though that would effectively disable the mod.
• Fermentation Crafting Time. I set the craft time to 1 second, but you can pick anything up to 10 minutes.
• Exclusion list. Any items you want exclude from being affected by the mod, put them here. This with exclude the item both from having its spoilage disabled and from having a Fermentation recipe generated.

A note on the exclusion list: This took a bit of fiddling to get right. The list expects internal prototype names, not the localised names you see in the UI. If, for instance, you want to exclude Copper Bacteria from being affected, the list will expect copper-bacteria - with that capitalisation. The list is technically comma-delimited, but it'll accept any sequences of whitespace and commas as separators. I tried to make it as fool-proof as I could, because I don't want you to deal with crashing issues from accidentally including a trailing space.

Credits:

Graphics for the Fermentation Plant were made by Hurricane046. In particular, I used his Chemical Stager. Except for the building's remnants when destroyed, for which I used a recoloured sprite of the Nuclear Reactor remnants. So if a wrecked Fermentation Plant looks terrible (which it does), that's my fault.