Hi, here are a couple of ideas I have in my mind for this mod.

Configs:

• Variables for default player size before and after shrinking
• Option for toggling shrinking devices' recipes and existences
• Option for toggling shrinking devices' behavior (shrink to 1 level and revert, continue shrinking while holding right click & reverse when shifting, toggle through levels if device support multi-level shrinking)
• Option for toggling tiered shrinking devices

Tiered System:

• Different devices based on different materials
• Custom devices based on custom materials with config options
• Fetch block or item textures for devices with custom materials.
• Customized recipes (Well I mean we have Crafttweaker & KubeJS, maybe for toggling recipes of default tiered devices)

Mod compatibility & others:

• Maybe to add the options for using mana from Botania instead of RF or some other kind of magic system?
• Options to enlarge to something like Titans? ;)
• Rendering distance adjustments depending on the size (this will be messy to code I believe)
• Warning message in chat when crafting the first shrinking device in a world.

Hopefully, this helps you develop the mod into something more than a shrinking device, like how morph gave its place back then. Nice work!

The mod has an api that can be used to add such mechanics. These will not be options in the base mod