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Implement stardew valley's hotbar swapping functionality to a hotkey. Pressing this hotkey moves each item in the player's inventory down one "row", wrapping the hotbar back up to the top row of the inventory.

This drastically increases the player's ability to access items from their inventory quickly without needing to shuffle around items and is great if you need something from the backpack "real quick"

Technicalities

For locked slots, i'd recommend skipping that cell in the inventory. If the hotbar slot 1 is locked, for instance, shift the rest of the player inventory for that column rolling over the locked slots.

https://www.curseforge.com/minecraft/mc-mods/hotbarcycle/

something like this?

I don't want to steal features from small mods. :)

That works, yep lol. Nevertheless it would be a good feature for ipn