Ok, I found the sound bug, so now you should hear a sound, when this option is switched on (bug fixed version in 1st post). If you don't like it, you can change it:
Replace tor.mp3 and tor_fav.mp3 (for sound, if favourite team goals) in /opt/meegoal/sounds with your own files.
I also added the icon, thanks again for that, fredson!