Some of those shadowed items may have been programed just for that reason. Not to let user's tamper with them, then get an extra 5 million tech-support calls. Although some are just information, that can be changed else where. My RAM speed is like that, shadowed at 200mhz, so i must change my HT ratio, then my RAM speed will ajust according to that. But for brand name computers that have this, its hard to tell if you can even change those settings.
What are you trying to do though?
Finished With TF.