That's a bit out of date, it's missing:
Code:
-w --window Run Dominions 3 in a window
-u --fullscreen Use the entire screen
--bitplanes X Try to use a color depth of X bits per pixel
--zbuffer X Try to use a depth buffer of X bits per pixel (default=16)
--gamma X Set gamma function (brightness) 0.1 - 5.0 (default=1.0)
You get the list by running
dom3 --help
Oddly enough, the '--help' option does not appear in the list.