That's a definition I've lived with for a few years, and it seems to bear the test of time. I am happy to have people use the gifts God has given them to tell the story in any way that is appropriate for them and for their audiences. These stories have survived for centuries, for millennia. Maybe we should ask ourselves why. We DO have many translations, of course.
Some translations are better for silent reading than aural performance.
We know that oral cultures did not have the same obsession with verbatim transmission as literate culture has. But we DO have a text, a text that we value and revere. So when I engage in that art form that I have called biblical storytelling in the specific sense, I do have an obligation to be responsible to its music, to stay within the orbit of the text. The teaching component of my ministry has as its goal nothing short of the transformation of the way the stories are performed for worship, education, spiritual growth and social action. We have a church that is story-starved, fed a meager diet of lectionary scraps once a week if that often.