Wolf asked me to elaborate a bit on all the billions of options you can configure in the template definitions (and site configuration). Before I start to do so I would like to point all to a new documentation page we have added to the documentation about generic configuration mechanism.
The essential chapter is the one about content 2 bean which describes how the configuration is transformed to java beans. The key point is, that if you want to know what you can configure you have to look at the java bean's code (resp. javadoc). This is also the mechanism which is used to setup up the module bean based on the configuration under /modules/mymodule/config
As a next step I will start to list most important properties of a STK template.