this feature feels like it would be kinda messy exeptionally since i dont know a single program with a feature like this
but insted i would like to redirect you attention to this thread here: Palette Organization?
if palette tabs were actually added you could just put tiny palettes in it and load it, and that seems like a much more reasonable request
thought i would like to adress one thing here, thats not the focus of this thread but being able to organize the palette without needing to create endless void indexes especially in rgb mode would help immensely organizing your palette.