Here is a list of the command line switches for Dom3.
http://www.dom3minions.com/docs/CommandLine.txt
I like nofade, no credit screen, no animated background, no music (after a couple of years I got tired of that), turning the click volume down, renaming on, changing the color of the plains on random maps to green instead of brown, setting water percantage lower and mountain percentage higher on random maps (creates a maze-like map with lots of choke points), indepts defaulting to 7, magic sites to 75. Oh and running inside a window rather than full screen.