since the random variables are hard-code in the script you have no way to mess with those through the developer console, but you can use unren.bat to look in the script for lust and mood variables for sis and mom and maximize those before starting a scene, that alone should cut half of the grind from the game.I'm done grinding.. how to cheat the stats?
anyway if the next version of this game comes with as much grind as this one i might consider creating a mod that cuts the grind to a minimum.