I have been asked this more than once in our company. We would like the ability to share another test case's steps, preconditions, expected results or what-have-you with newly-created or edited test cases. So, for example:
Test Case 1 (already exists)
* Preconditions: A, B, C
* Steps: D, E, F
* Expected Results: G, H, I
Test Case 2 (creating..)
* Preconditions: J, K, L
* Steps: D, E, F (want to be able to see/import Test Case 1's steps)
* Expected Results: G, H, I (want to be able to see/import Test Case 1's expected results)
Test Case 3 (editing..)
...You get the picture...
...So, all in all, we find it of value to be able to import (via AJAX or something similar) from other test cases to not have to copy/paste, duplicate text and/or export/import through the facility you have provided.
Thanks!
-Richard