Holy cow, Rob, you've asked a mouthful.
The outputs on your Dishplayer are similar to those usually found on DVD players, so maybe some other ATers will find this useful too. PCM, or "Pulse Code Modulation" is the type of connection you would use when all of the digital decoding is performed by your Dishplayer (or other source device). A PCM signal can carry DTS, Dolby Digital, MPEG2, and of course, PCM audio such as music CDs.
The RAW output is what you would use if you prefer your receiver to perform the necessary digital decoding.
The "best" one to use is dependent upon the capabilities of your devices. If your DVD player (or Dishplayer) offers support for all of the digital standards you need, you can use PCM. If you have a surround receiver whose built-in decoder will handle all of the standards you want, you can use RAW. Be careful, though - if your player outputs a PCM mode that your receiver cannot decode...DTS EX, as an example...you can easily damage your receiver or speakers.
For that reason, I usually recommend using RAW and letting the receiver perform the surround decoding. There are other minor advantages to this as well, but to go into them is pretty thoroughly outside the scope of the Hot Deals forum.
As far as your Dolby Digital question; unless you're in Berlin, Germany, I don't think that you will find any programs broadcast in Dolby Digital 5.1. Most Dolby Surround TV program material (including sports coverage) in the US is broadcast in analog Dolby Surround. As far as PPV movies, remember that the original material is usually Dolby Digital compatible, so whether or not you get it in that mode depends upon your satellite provider.
About your last question, that isn't really my area of expertise, but I can tell you that you will need the game program and your sound card to be fully compatible with the digital standard you wish to hear. Otherwise, you'll be stuck with whatever virtual (fake) surround modes that your receiver's DSP (Digital Signal Processor) is capable of synthesizing from a normal stereo signal. You'll need to read your game, sound card, and receiver manuals to find out more.
Good luck! Carl