DOS32A is a more advanced extender and open source replacement to DOS4GW. It can improve both performance and stability of Command & Conquer.
sb /r game.dat
Allows enabling hidden options within the game. Most useful perhaps it the ability to increase the netgame player limit to 6 and allow 1v1 game with AI players. More info here.
-cd[cd contents folder]
width, height = equal to computer resolution
While in-game, press Esc to open a menu, press game controls and move the game speed slider to adjust the game speed or scroll rate slider to adjust the scroll speed.
See Rainbow color problems in older games for solutions.
If you happen to have the game on CD, that means No-CD option is turned on. Either turn off the option, copy movies.mix from the CDs into the installation folder or just download the videos.