Player simulators currently seem unable to properly use items that require multiple clicks to use, such as fishing rods and leads. Could this ability be added?

This should already work. Will look into what is going wrong there. If it's too complex too fix, I'll add functionality for this in the future, as I intended to release these new world interaction features soon.

Items like this work now.

The only limitation is that their related entities won't be rendered, due to MC requiring (fake) players to exist client-side. Perhaps I can come up with a clean solution to fix this in the future.
Following up in #50