Yup, this is fixed!

Hi, I've noticed something I believe to be a bug; If a furnace has a high enough speed and productivity it won't output all the extra plates it create when it's not smelting actual ore. When a furnace has the following stats; http://factorio.asnejbjerg.dk/furnace_stats.png And I input 50 copper ore ...

I would go for DaveMcW's method instead and use an array.

That way it would be possible to create researches for just some items or even single items.

But what if one wants to make a research to increase stack sizes?

It wouldn't matter, if you just want a static stack size, there are loads of mods out there that change the stack size, but it would be cool if it was possible to change it runtime.

That's not likely to happen. If any property can be changed runtime it has to be saved in the save file regardless of it being used. So you're currently not saving any data of the prototypes in the savegame files as is? Because a single property shouldn't change savegame filesize by much. So includ...

Make stack_size writeable

Desired usage: In a mod where space is a factor and one has to mine a lot to expand ones base. This is instead of having to create new items to support higher stacks on not change the base item.

Edit:
Sorry, this was posted twice.

Would it be possible to make the stack_size property on item_prototype a writeable property?
I could really use this in a mod I'm currently working on.