The application I believe, at least it did when I did mine, REQUIRES your passport information when you submit and the national ID is something else entirely.
TRAVEL DOCUMENTS AND PASSPORTS
Passports or travel documents for you, your spouse or common-law partner and dependent children. Include only copies of pages showing the passport number, date of issue and expiration, your photo, name, surname (family name), date and place of birth. Children must have their own passport, separate from their parents. If you reside in a country different from your nationality, include a copy of your visa for the country in which you currently reside. Please note that all prospective immigrants must hold a valid regular passport; diplomatic, official or public affairs passports are not valid for an application for permanent residence in Canada
This is from the immigrant's checklist (3910e) last update March 2014. For US applicants. So I don't believe you can tell them you don't have one and will submit it later, they'll probably return it as incomplete. If you don't have one, wait until you get one to apply or it will cause problems. Not sure if that answers your question.
I didn't check the NID part off and I had no problems.