These options are only available in certain modes...
if you check the e-manual and look up changing the picture size, certain options are only available with certain types of input. For example, screen fit needs an HDMI input of 720p/1080i/1080p or component input of 1080i/1080p and wide fit is only available with HD 1080i/720p signals in 16:9 format. I found this out today when my DVD player was displaying an image at the bottom of the TV screen and cutting off the subtitles - I cannot adjust the picture position with the picture size I had.
Very annoying Samsung.
Resurrecting old thread as someone may find answer useful!