Installation: 
Download the file and replace in \steamapps\common\Stardew Valley\Content\Data.

The file makes any item inedible if it can be put in a seed maker, jar, keg, cask, oil maker, you name it.
This includes every fruit, every vegetable, some foraging goods and most flowers (if they can be put in Seed Makers), as well as any eggs, milks, truffles, cheeses, wines.

Now you can right-click and hold all you like.

Known issues:
Items you already own before installing this mod can still be eaten. You can fix this by splitting the stack, and the new stack should be inedible, or if you have two stacks of the same item, one stack edible and the other inedible, you can combine them into one stack of edible/inedible. I.e., if you have a stack of items that can't be eaten, and a stack of the same item that can be eaten, you can put the inedible stack on top of the edible stack for a greater edible stack, or you can put the edible stack on the inedible stack for a greater inedible stack.
Items that can't be eaten can't be put in the Luau soup. Imagine my surprise when I found out that was how the Luau worked. There are still items you can put in the soup for the best response, though. These are, of Silver quality: Crimsonfish, Ice Pip, Lava Eel, Legend; Gold quality: Angler, Catfish, Chanterelle, Crimsonfish, Glacierfish, Ice Pip, Lava Eel, Legend, Mutant Carp, Purple Mushroom, Sturgeon, Super Cucumber.