We rolled it out as a feature in the latest versions of the theme.
I believe now is possible with Edwiser RemUI versions 3.5.11, 3.6.8, 3.7.7 & 3.8.0.
There is a setting part of Edwiser RemUI which could be enabled or disabled for this purpose.
Simply follow this path Site Administration > Appearance > Themes > Edwiser RemUI > General Settings > Checkbox to enable "Course Edit Button" at the bottom of the page
In the solution that I suggested Admins will be setting the default state of the activities within a course and later when students explore the course whatever status they set the course activities it will be displayed accordingly.
So in a way it is actually working in the same concept that you had suggested just that we have provided admins an option to choose the default state for course activities.
Adding some more information as suggested by Edwiser RemUI patron Rakesh B,
Feature Request -
Ability of admin to create multiple site announcements,
User can choose to cancel the announcement that he/she has seen,
Apart from that a ticker like feature that lists all the announcements one after another,
Placement of announcement bar above existing menu section for better visibility.
If you too wish to see this feature as part of Edwiser RemUI then you could upvote this query and also add any suggestions to improve this feature and make it more user friendly.