Maybe 'Mark as need fixing' would be more appropriate as translations are already marked outdated by AMOS if the original string changes.
This function would also come handy when approving contributions. If during the review I notice some mistake, I need to change to 'edit mode' to fix the string and thus loose the color coding and diff information of the 'review mode'. Switching between them takes quite some time. If I could mark the strings, I could go and fix them all after finishing the review.