A collapsible feature would be useful. With the following 3 options:

Collapsible behavior:
[ ] None.
[ ] Collapsible, expanded by default.
[ ] Collapsible, collapsed by default.

Please find attached mockup for example.

It as been done in the module imagefield crop widget version 5.x-1.0: http://drupal.org/project/imagefield_crop

CommentFileSizeAuthor
collapsible3_cck_map_Collapsible_collapsed.jpg3.06 KBfrancewhoa
collapsible2_cck_map_Collapsible_expanded.jpg16.98 KBfrancewhoa
collapsible1_cck_map_None.jpg15.41 KBfrancewhoa
collapsible0_cck_map_config.jpg26.38 KBfrancewhoa