The webapp is bundled inside the plugin, so you can easily start it by pressing F9 without needing to install any software first. The process of compiling makes it unreadable for humans; not because I want to obfuscate, but because this is a very reliable way to package a web app inside a plugin.
When scrolling down, you can see that the game code itself is readable.
Yes, I can. In the meantime, you can open the config_battle.json in uicustom folder of your game and directly write any number into this field.
EDIT:
Making something like a cross is very difficult to implement and also increases the risk of incompatibilities with other plugins.
