Oh, yes, baby; you bet your *** there's progress! Here's how to enable it: Open the file /usr/share/policy/etc/current/alsaped.conf and replace "jackbias-off = jack-bias: off" with "jackbias-off = jack-bias: on"; reboot and watch the System bus. I will be uploading an "enabler" package to extras-devel later on today along with a quick daemon that pauses/plays a track in the Media Player. Ultimately, if thp allows it, I'd like to get it into headphoned but thp uses libdbus and I like dbus-glib...
Nokia-N900-51-1:~# uname -a Linux Nokia-N900-51-1 2.6.28.10power-omap1 #1 PREEMPT Thu Apr 15 00:30:53 EEST 2010 armv7l unknown
jackbias-off = jack-bias: on