Something else WANTED is fields with multiple lines as native implementation.
What do you mean ?
Being able to write a field with multiple lines without writing it manually in a text area ?
Or something else completely ?
I think he mean displaying textarea instead of input for editing a tiddler. This is already possible: https://tiddlywiki.com/#Customizing%20EditTemplate%20field%20rendering (demo)
I want to have all fields possible to use with multiple lines.
The solution from @telumire should be available to all fields 