Freetype can be configured through environment variables (see /etc/env.d/99lcdfilter for a list of the variables and their description). Those variables can be overridden on a per-user basis by either redefining them in a startup file (such as ~/.bash_profile) or by sourcing the /usr/lib/ft-settings.sh script with the desired style in parameter (you can, of course, source the script from a startup file).

usage: source ft-settings.sh <style>

Possible styles:   
  default      - Use default settings.  A compromise that should please most people  
  osx          - Simulate OSX rendering  
  ubuntu       - Simulate UBUNTU rendering  
  linux        - Generic Linux style - no snapping or certain other tweaks  
  windows      - Simulate Windows rendering  
  vanilla      - Just subpixel hinting

Infinality styles:  
  classic      - Infinality rendering circa 2010. No snapping  
  nudge        - CLASSIC with lightly stem snapping and tweaks  
  push         - CLASSIC with medium stem snapping and tweaks  
  shove        - Full stem snapping and tweaks without sharpening  
  sharpened    - Full stem snapping, tweaks, and Windows-style sharpening  
  infinality   - Settings used by Infinality