Add an option to show the held item regardless of what item it is. Regardless of namespace, regardless of name.
Also, if it is an empty hand, show that too.

Sounds great, I believe this is a feasible feature. I'll look into adding it for the next version. :)

I assumed * would do this, but it crashes. *:* doesn't crash but also doesn't work as expected.

I assumed * would do this, but it crashes. *:* doesn't crash but also doesn't work as expected.

Using "minecraft:*" works well.