Both of these codes are command line switches. That means you have to use them as a parameter behind fallen.exe -[parameter]
MQWIERDSTUFF - Access secret units. You can build them from the barracks.
MQCASH - Use [Ctrl][+] and [Crtl][-] to increase or decrease credits.
Fallen Haven Database "Hack"
There is an easy way to change the behaviour and attributes of all Units with a simple Editor like Notepad. In the "Units"-Folder there are Files, calles "Human.unt", "Alien.unt" and "Neutral.unt". These can be opened with notepad and you will see clear text and some numbers, which can easily be changed. Note: Just Change the Values "Movement", "Cost", "TimeUnits", "Hp", "Upkeep" to ensure, the Units will work and the game will not crash. Also note: I haven't figured out yet what "Initiative" means. And I still dont know how to enable this "ZenMaster"-Unit.
There are also Files for the Buildings (Structs/Human.stc) but still here: Just change the values relevant for fightung, never the optical ones. This could cause the game to crash.
Note: Every change will effect ALL Units. So if you change a human Unit and start an Alien-Campaign, the enemy will have the new Units. So be careful with overpowered Units (Or: You can also downgrade the enemy-Units to make the game more easier)
Following some examples and what happens:
Structs/Human.stc: (Mining Facility) - Production Cash=4000 - Mining Facilitys of the Humans now will produce about 40 times the credits as before
Units/Human.unt: (Artillerie) - Cost=1, Upkeep=0 - This unit now will cost 1 Credits and needs no upkeep.