[Ygorl]

Pasha may be a lawyer, but he thinks like a scientist... He doesn't need a reason!

Yes, entered in Terminal. Might look something like this:
cd ~/Desktop/Dominions2/dominions2.app/Contents/Resources/
../MacOS/dominions2 -r 1920 1200

You need to start the game from dominions2.app/Contents/Resources/ or else nagot gick fel. But the game app is in dominions2.app/Contents/MacOS/ so that's why you need the first line and the ../MacOS/ in the second line... Incidentally, the above (on one line separated by a semicolon) inside double quotes and preceded by "do shell script" (not in quotes) makes a dandy AppleScript that you can use instead of the .app if you want to play at high resolution...