Looks like we have found the way to play Berba,Tevez,Ronaldo and Rooney together.Personally I call it our 'Blitzkrieg'.I've analyze this formation a few times now and all four of them are playing in their natural position,except Rooney...then again,Rooney can play almost everywhere! When we are under pressure to score,I noticed we always play this way.
There will only be two natural central midfielders,like Carrick and Fletcher.Berba will drop deep almost like an attacking midfielder.Rooney will push onto the left side,almost left winger role.Ronaldo in his natural right winger role but will push forward like a striker to support.Tevez will play the lone striker and will harrass and pressure defenders with his bulldog like approach.
They will crowd the midfield without possesion which will make opposing teams to bypass passing through the middle,hence the long balls,which will be picked easily by Rio and Vida.Carrick and Fletch will only need to distribute forward to their front 4 and pick up scraps in the middle.
I think we start like this against Arsenal,we will stand a chance because it will cut out their slick passing in the middle or thru Fabregas.Start like this get a goal or two and then revert back to our normal 442.It should work when we have the right players.