Correct.
By the way, I succeeded to have the radio working (headset plugged) and the sound through the speaker!
If I remember well, this happened when I pressed the "power" top button while the volume control window of the radio applet was in focus. It more or less locked my N800 (I had to remove the battery), and afterward, no way to listen to radio with my headset!
After multiple reboot it went back to normal situation.
I didn't tried to reproduce it, but it seems it is possible to have headset plugged and the sound going through the speaker.