Thanks on the feedback and answer, gonna try to work on that during this week and hopefully have good news and can come with an update that adds that support.

Have you take a look at this mod to see if it does it? Apparently to do it right, it's more advanced and need a way more complex code to what I'm using.

https://minecraft.curseforge.com/projects/initial-inventory

Maybe that mod does the job.

Ohh yes I know what you mean, an old Mod for 1.7.10 use to do that.

That's a great idea, I believe I can implement that, either find a way to remove the specified item, or just delete the whole inventory on start.

Gonna work on that feature and try to add it for the next update. Thanks a lot for the idea I really like it ;)

Done and waiting approval ;)

Added a config to completely delete player inventory on first join to a new world (Note if you enable this on an already existing world, your inventory will get deleted on your first join, so be aware and move all your stuff to a chest before doing this)

Also if you need X items back you can give those with the mod as technically it should first delete the items and then give the ones on the list.

Also, it might not work for some items, depending on what mods give the items and at what time that mod spawns them.

If you experience any problem, let me know so I can look at specific conflicts ;)

That's how it works it generates a SimpleInventoryStarter.cfg file where you can customize the items

# Configuration file

general {
    # Enable the Starting Items [default: true]
    B:enableStartingItems=true

    # List of items player should start game with. [enableStartingItems must be true for this to work] Format modid:item,amount,metadata Example for 2 Lapis Lazuli: minecraft:dye,2,4 [default: [minecraft:wooden_hoe,1,0], [minecraft:wheat_seeds,16,0], [minecraft:dye,2,4]]
    S:startingItems <
        minecraft:wooden_hoe,1,0
        minecraft:wheat_seeds,16,0
        minecraft:dye,2,4
     >
}

That's the default example that comes with the mod.