Skin Debug / Development / Modifications tools?

I have recently started to build my own Kodi and worked based on the Aura skin.

I know I can call the built-in function skin.Toggledebug and map it in keyboard.xml under userfolder/keymaps to toggle on / off skin debug.
But are there more tools for development and modifications?

I'd like to modify some icon size but I don't think it's under home.xml as shown - the parameters are obviously under one of the many includes, but how can I trace that?

Ideally if there's a tool that is similar to 'Inspect Element' in web development for Kodi...