I will definitely look into it. It's probably hidden in one of the many plugins Indivi made for the game.
Also, I don't know how many people would say JavaScript is any more of a 'real programming language' than Python. xD
Sorry for the necro. The stack size is set by plugins/YEP_CoreEngine.js, to change it change the "Default Max" in plugins.js. There is a small visual bug with the x being drawn under the number, but that can probably be fixed by changing the drawItemNumber functions in plugins/!Indivi-StorageSystem.js
And don't put yourselves down guys, programming isn't about languages. Once you can write something in one language, you can spend just a couple minutes to learn the syntax of a different language and write it that one, be it Rust, PHP, Java, C, Assembly or even as a transition function of a fucking Turing machine. It's all the same