That's a feature. Length is the number of entries, and specifying a precision allows an 'N/A' entry. Its all in the help files... which I now realize got lost in the last update...
You can access them at: http://[yoursite.com]/[yourmoodle]/mod/questionnaire/phpESP/admin/manage.php?where=help#types
mike
Questionnaire (plugin)
Rating Scale...bug? or by design
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