I am currently using the latest version of PlayerPro and there doesn't seem to be any settings regarding the pausing of music when headphones are ejected, I have the same version of PlayerPro on my Sony Xperia T and it pauses the music when headphones are ejected.
I have tried to use the Smart Connect app, this seems to work but I have to set it to open PlayerPro when headphones are inserted which isn't what I want it to open when I connect headphones. The smart connect app also runs another instance of the app so if I have PlayerPro running already then insert headphones the smart connect will run another PlayerPro which will have 2 songs playing at the same time.
Anyone have any idea how to get it to pause when ejecting headphones?!!!