Warne captured 4-74 as Australia whipped the Proteas by 184 runs in the second Test to take a 1-0 series lead to next week's final Test in Sydney.
But Test cricket's leading wicket-taker, who finished the 2005 calendar year with a record 96 wickets and 657 in his career, generated debate with his vociferous appeals for wickets.
South African coach Mickey Arthur said the 36-year-old was a master at pressuring the umpires, and the debate gathered more steam on Friday's last day of the Test match.
Broad rejected suggestions that Warne should face disciplinary action for his robust appealing, particularly to rookie Test umpire Asad Rauf of Pakistan.
"There is a line and that line has been pushed, perhaps in this game. But according to the umpires they (Australia) haven't crossed it," Broad told reporters.
Warne was at odds with the interpretations of Rauf and his bended-knee beseeching often went unrewarded. But there was a sour taste over the crucial dismissal of No 5 batsman Ashwell Prince during Friday's first hour of play.