Have you seen Wimpy Player ? They have various products: from a simple sound button to a video player with a playlist.
I am not sure about skipping to different parts of the file, but they say that it is programmed using Ajax, and I know that you can set whether it will start automatically or not.
I used this for a while, but later changed something with a simple play / pause button.
(By the way, I don’t understand your interest in the streaming player. If the user first downloads the file, why do you need an interface? Won't they just open it in any way? The program that they use on their computer?)
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