It'd be awesome to see a back slot, used similarly to the scabbard for swords - namely for bows, crossbows, or other larger tools the player might put on their back. Ideally supporting multiple displays e.g. both a sword at the player's hip and their back item at the same time; BackTools is an example of this implementation that is unfortunately left on 1.16.

This feature is on the chopping block and will rather be removed than improved(like having tools on the back). The reason behind this: there are other mods that do it better with new slots/correct sync, and it doesn't even fit this mod(it's not an animation).