That's on our todo list ( http://www.ventismedia.com/mantis/view.php?id=10193 ), but in the meantime, you can use either of the following small apps for this:
https://play.google.com/store/apps/details?id=com.launcher.plugin&hl=en
https://play.google.com/store/apps/details?id=com.wormskin.headphones&hl=en

Or if you want a bit more automation, the following work nicely as well:
https://play.google.com/store/apps/details?id=com.sonyericsson.extras.liveware&hl=en
https://play.google.com/store/apps/details?id=il.co.kix.minitasker&hl=en

Thanks.

-Rusty

Great beta software and awesome ui. Unfortunetly its missing a couple of options that all music players should have. They are resume on headset connect, pause on headset disconnect and the same with Bluetooth. Until they are included, playerpro will have to do.