Coming from using the Tool Belt mod for years, there are few features from there that I think you should consider.

I dont want to sneak to switch a tool in or out. Instead of pressing two different buttons I just wanna press one and scroll to the tool and release OR press the same button again, or a click, or something.

Instead of tools popping into your inventory, switch with the currently held tool. (I may have gotten a crash with a full inventory, but I didnt bother trying to figure it out.)

More slots. Configurable or some way of adding more in game, I dont know. #34