Yes you are right IMM 0008 in the declaration section signature option blocked, as I tried today alot of time and tried number of signature apps but no one is working on that section .we have to print it but not everyone have access to printer , and in Covid lock down most of the public libraries closed , staple closed ( ontario) , convience stores open with reduced hours of operation. On top of that IRCC saying you have to do this application by yourself , not allowed to use Representative.If you are able to type your native alphabet name electronically, you should do that.
The reason why we need to print these forms out and to scan it back is because you literally can't sign those forms electronically. The form is secured and just does not allow you to place an electronic signature (try it out yourself to see what i'm talking about). The signature function is blocked.
That's why you fill out the form electronically, print it and sign manually, and then scan it back into a digital format.
This applies to the Schedule A Background/Declaration and the Additional Family Information forms. I think the Travel form doesn't have any signature, but i don't know if they are gonna have any additional forms of a similar type. Plus I also haven't checked other forms that might be required for your applications (common law, representative, etc.)