well i am a sound n00b and have not used the features. I think the manual Doppler shift does not work but the automatic one where you set the listener, set the positions and set the velocity does. Timing also appears not to work but i am not timing any thing with sound. They complete when thy should after being played. But yes treating the features as they are not there is not a good solution 
But even without these it still a free sound system.