Flow Player Classic development has ceased, the new Flow Player version 3.0 uses a different set ot parameters and has options you are looking for, but PowerPress does not include Flow Player 3 because it is not freeware (it is GPL, but you can only get access to the source if you purchase a license).
We have included 4 other players to pick from. If you enable the "Player options" under "Advanced Options" in the bottom of the PowerPress settings page, you will see a new menu option on the left called 'Audio Players' here you can pick from all 5 players packaged. I highly recommend the MP3 player Maxi myself, but many like the 1 Pixel Out player.