Unlike the predefined customization options which follow a clear pattern of allowing the user to quickly specify their preference, the themes also provide a more flexible, albeit difficult, mechanism to control things with precision (Customization Options).
This section is of interest only to users who are prepared to maintain their own local tweaks and who are willing to deal with any possible incompatibilities between versioned releases of the themes. As such, they are labeled as “do-it-yourself” or “DIY”.