Could you add support for Packmode, so that in the config you can disable the slots for certain pack modes or determine the amount of locked slots?

Could you explain what that mod does? That mod's descriptions is entirely based on prior knowledge on what a "pack mode" means, which I don't have.

@EmosewaGamer Is this a tool for assembling mod packs? So like they can have presets? Or what?

Well it adds a config in which you can add or select pack modes. By default it only has support for CraftTweaker, but it has an API that mods suck as OreExcavation Integration have used to make their features limited to when a certain packmode is selected in the config.

Yes

Ah, ok. I'm currently away on business, but I'll get in contact with SkySom about how to implement this when I get back on Monday.