A possible work around would be to go to this file.

/var/lib/pulse-nokia/ihf.parameters

Look through the file with a text editor untill you see this line:

x-maemo.alsa_sink.mixer_control = "HP DAC: control,Headphoneff,Earphone: off"

And change it to:

x-maemo.alsa_sink.mixer_control = "HP DAC: off,Headphone: off,Earphone: control"

And restart pulse audio daemon, I know it's not practical for a program but it's still worth a look.

Edit: On second thought forget it...I think it's too risky.