No. This is unethical in publishing. If this is done, your article will not be published;
And if it is printed, it will be invalidated. Your name will then be blacklisted and no other articles will be accepted from you.

Any addition, deletion or rearrangement of author names in the authorship list should be made only before the manuscript has been accepted and only by receive confirmation from all authors.

No. It is not necessary. Only the responsible author will register in the system.
But all authors should be aware of their responsibility for the article. 
The order of the names of the people and the responsibilities of each of them should be clear in the article.