The full listing of the options is available in the manual page. Here are just a few tips:
Use the channels option. An example:
-radio channels=104.4-Sibir,103.9-Maximum
Explanation: With this option, only the 104.4 and 103.9 radio stations will be usable. There will be a nice OSD text upon channel switching, displaying the channel's name. Spaces in the channel name must be replaced by the "_" character.
There are several ways of capturing audio. You can grab the sound either using
your sound card via an external cable connection between video card and
line-in, or using the built-in ADC in the saa7134 chip. In the latter case,
you have to load the saa7134-alsa
or
saa7134-oss
driver.
MEncoder cannot be used for audio capture, because it requires a video stream to work. So your can either use arecord from ALSA project or use -ao pcm:file=file.wav. In the latter case you will not hear any sound (unless you are using a line-in cable and have switched line-in mute off).