Each fast bowler has his own unique swing pattern/shape. This is obviously due to his wrist position, action and how he grips the ball/ seam position. For example Steyn and Jimmy have that very late outswinger that is shaped like a banana and Waqar had a similar shaped inswinger.
Is it possible for a bowler to attain a variation in his swing pattern by slightly adjusting his delivery each time in order to bowl with a different swing pattern? Has anyone ever managed to gain control over this particular variation and if someone did manage to do so how would that translate into that players success as a fast bowler? It would be a pretty impressive skill to have. I mean imagine if Steyn in one delivery bowls his typical outswinger but in the very next he changes it to one that swings with a different pattern. Would completely fool the batsman.