yes you need to set it to false. Unofrtunatley it isn' that black and white. Yes ffmpeg encoder is a very fast encoder but I think handbrake is the fastest encoder followed by ffmpeg and then mencoder.
But anyways you can play with the order settings and see and post your results where which one overall works fastest for you
But anyways you can play with the order settings and see and post your results where which one overall works fastest for you