What is the use of Use a dynamic template option in delivery setting and where we can use this option, which is marked in yellow 

Is there any option in ACS to make 700px default instead of 750px for structure components, we can change this value from HTML from 750px to 700px buy it will not change default value

Can we create custom roles/permissions in Adobe campaign standard if yes then how to provide custom permissions to custom security groups in ACS?

how to provide visibility access of fragments in ACS to other users, As I am working on 1 fragment but others not able to see that fragments ?