Allow modifications/changes for Admins after project closure without impacting the actual Compl. date (maybe manual Completion date override possibility?).

I'd like to be able to correct any project data after Completion.

Sometimes my Planners need to correct some things that were made by mistake. Now if we want to do so that will impact the Project Actual Completion date which is very far from being ideal for sometimes a really stupid but annoying mistake and impacts our figures very seriously.

If I (as an admin) could do that without impacting the completion date, would be great. An alternative solution could be if I (again as an Admin) could override the Actual Completion Date after the project closure manually.