Hi Levente,
We see this kind of problem often with our clients and it is not Moodle's job to stop navigation inside the SCORM, that is the SCORM's job, so it will need to be created in that way.
From our perspective it is much easier to just present content with SCORM and then do your quiz in Moodle's Quiz tool, it will be much easier to manage, much better on compatibility and less SCORM work and it will lead to less time required to create content or less cost to creating those SCORM packages.
We see this kind of problem often with our clients and it is not Moodle's job to stop navigation inside the SCORM, that is the SCORM's job, so it will need to be created in that way.
From our perspective it is much easier to just present content with SCORM and then do your quiz in Moodle's Quiz tool, it will be much easier to manage, much better on compatibility and less SCORM work and it will lead to less time required to create content or less cost to creating those SCORM packages.