It's not exactly a mod, but you can try following the steps provided here on the 1c forum.
http://forum.1cpublishing.eu/showthread.php?t=8134
Basically you can get tips on how to edit save games, making units come instantly, cost nothing, even change what unit is deployed (though i couldn't figure out that part personally). It's an easy process, just change a few lines of text in a saved game file.
So all you do is start up a game, save it, edit it, have fun.