I used the demo version of IDA Debugger (http://www.hex-rays.com/products/ida/support/download.shtml) to find out which C++ function was called (based on a string search by the function name), found out the return value address and the right addresses on the file.
Sure, actually is a very simple change, here's my notes: I think it's a good idea to backup and delete you config/save files, at "Documents\My Games\XCOM - Enemy Unknown"
So I found a way to unlock some cool stuff for modding (debug menu, console, etc.) http://imgur.com/a/lNmdr Unfortunately it involves hacking of the executable file, more information soon.