Large quiz won't submit due to PHP max_input_vars value

When submitting a large quiz (more than 600 questions) an error occurred with the following message :
A required parameter (attempt) was missing

this is due to missing fields in $_POST.
Its size is imposed by the max_input_vars setting (1000 by default) in the php.ini file.

Steps to reproduce :
With a default php installation,
1. create a quiz with more than 600 questions
2. access the preview mode
3. click on "Quiz navigation > Finish attempt..." or on the "Check" button of any answer.

Result :
the error message above is displayed

What was expected :
either the submit process is correctly done (the better case)
or prevent the creator of a quiz to create a too large one.