There are over 500 settings and i have a B-B-Q on the go.....
Most of them are easy HPOS, VPOS WID HIT
There are clumps of settings which begin N which adjusts NTSC settings, ending in 4, adjusts 4:3 only. stick a W in there and it is Wide.
NWHP - example NTSC, Wide, horiz postioning.
It is probably easier to ask what you want changing and then we can tell you what codes to look at as they are not all as simple as that.
Google under the uk.media.home-cinema group will give you tons of responses and info on the main service menu codes and a few designer menu ones.