Prolonging the last sujood is an action that is not prescribed in Islam
Question

                A man following the Imam is fond of prolonging his last Sujood that at times the tasleem will be said before he rises from the sujood. His argument is that the prophet said that in the lsat sujood we should perfect prayers.What is the ruling regarding his salaat?
Praise be to Allah.It is not permissible for 
          the person who is praying behind the imaam to precede the imaam. It 
          is haraam for him to move before the imaam, or to lag behind him so 
          much that he misses the obligatory part of the prayer that comes next. 
          The Prophet  (peace and blessings 
          of Allaah be upon him) said, “The imaam has been appointed to be followed. 
          So when he says ‘Allaahu akbar,’ then say ‘Allaahu akbar,’ and when 
          he bows in rukoo’, then bow in rukoo’.” The conjunction fa’ (translated 
          here as ‘then’) implies following immediately, as is well known [in 
          Arabic grammar].  
Shaykh ‘Abd al-Kareem 
          al-Khudayr  
The idea of perfecting 
          the prayer does not contradict the idea of following the imaam, so long 
          as the imaam is unhurried in his prayer. There is no evidence for singling 
          out the last sujood and prolonging this sujood but not the others, and 
          it is not permitted to introduce innovations into the religion. And 
          Allaah knows best.