Hi Gary,
1. It's faster to use the direct code entry, though it won't give you all the options.
2. Night mode typically means that dynamic compression is applied to the Dolby Digital sound track. This means you can keep the volume at a lower level and still hear the dialog, thus it's called "night mode." I believe it's a feature of dolby digital, so it doesn't do anything for other types of sound.
3. Your best bet is generally to use 80Hz for a crossover all around. Anything higher makes the sub much more easily localizable (it sounds like it's coming from the corner).
4. EZset may do a decent job, but it's probably worth double checking with a sound meter.
5. Don't know about reusing digital ins, but your problem may be that the component video exposes all the flaws of the signal. My digital cable quality is very blocky, even over composite video.
6. Sounds correct.
7. My apartment isn't big enough for surround sound!
-Cooper
