Yes, controlling the ripple will limit reprocessing and also the need to redo previously made-up pages
Yes, right up to the moment of output, listings may be edited, deleted or added.
Yes, ads can be added or deleted up to the moment of output. This is a good example, depending on the size of the ad, controlling the ripple effect of such a last-minute change can be most efficient.
Two days.
Yes, a full search and replace function is available to alter tagged files entering the system.