I do not think this has been spread enough, so here goes:
With last week's update, the steam version of Amnesia now support total conversions, ie being able to supply the main config file as a command line argument. (see here:
http://wiki.frictionalgames.com/hpl2/amnesia/full_conv )
Total conversions allow you to change a lot of the game's settings (how fast sanity runs out, movement speeds, etc) and also fun stuff like having a custom main menu background and start up credits. So even if you are not doing any major hacking, a total conversion might be something to consider.