Thanks for the feedback.
1) We added that Permissions Manager feature on Pro 2.1.0, X 6.1.0, Cornerstone 3.1.0 update.
The admin has all the rights by default. Regarding the Advanced mode, there are users does not want the other complicated settings of an element, and there are users that want all the settings, so we give them the option.
2) I wrote above.
Background-image option are on Section, Row, and Column. With your screenshot provided, you need to apply the background-image on the Section.