It would be nice to have an Mod which allows you to individualy change the size of certain parts of your GUI (like the GUI-Mod in Badlion for example).
Like you can have a "large"-Inventory, but keep a "Medium"/"Small"-Hotbar.
Would be especially good for things like pot- or soup-pvp where a bigger inventory is good for easier or better refills, but you dont want a "large"-Hotbar.