It /would/ be easier to use the generator creation area to create a 30. It's pretty much always easier to move from a very precise, delimited format to a freeform one. The reverse is...slightly more difficult. Go to Comment
To make this work well, we should have a fixed interface for List submissions, where you create the elements one by one. This does not lend itself to, for example, my workflow using external docs and pasting it in.
It would almost be easier to use the Generator creation screen to create a 30 :).