To my knowledge, only form IMM5669 needs to be signed both electronically and in writing. You can find that information in your checklist (IMM5533):
"IMPORTANT: for this form to be accepted as part of a paper application, each person required to complete it must: a) type their name in the signature box at the bottom, b) validate the form, c) print out the validated form, and d) sign in writing (i.e. providing a handwritten signature) next to the typewritten name in the signature box."
I believe all the other forms need to have a handwritten signature - hopefully someone else can confirm.
That's correct. Only IMM5669 needs to be signed electronically and in writing as per instructions on the Checklist Page 3 Number 9.