Oooops, I stapled each section of my documents, and used a binder clipper to put them together.
I did this with advice from my friend, who just went thru the procedure and obtained citizenship this January.
So I think it won't be a show stopper if each section is stapled.
The only place CIC require not to staple is the photo. I used a small paper envelope to hold my photos, and stapled it onto a A4 paper(not the photos). Then I put this A4 paper into my package.
I used a content divider to organize my documents.