Console fmradio app released. Just install on your n9/n950, restart phone, plug earphones and run in terminal :
$ fmrx -f 99.9
replace 99.9 with desired frequency.
Ctrl+C stops it.
If you dont hear sound, stop program, unplug/plug earphones, then start fmrx again.
P.S. This is not my app, see www.maemos.ru/forum/index.php?showtopic=3003 for details (in russian) .
P.P.S. The guy, who is working on this stuff says that fm transmitter app will be released soon