Hi Philippe, the short answer is it's not doable without some custom coding. See this thread: https://moodle.org/mod/forum/discuss.php?d=339451
Work arounds are available depending mostly on what authoring tool you use, and most of those involve just escaping the Moodle iframe and the scorm package opening it's own window.
For a SCORM package being tolerant of going offline, I think that is dependant on your authoring tool. What are you using to create the SCORM packages?