(Adds details, quotes) By Sonia Oxley MANCHESTER, England, Sept 17 (Reuters) - Wayne Rooney scored twice against Bayer Leverkusen on Tuesday to reach 200 Manchester United goals as he enjoys a new lease of life under David Moyes who thinks he can become one of the club's greatest predators. The striker's commitment to Old Trafford had been questioned and he was left out of key games last season under Alex Ferguson, who also took to playing him in more of a midfield role as Robin van Persie took the goalscoring glory. ... More...