Some of the most advanced options can only be changed by editing the application configuration file with a text editor. This is a standard text file (you can edit it with notepad or your editor of choice) and it contains data structured in the XML format. You don't have to learn the XML format to edit the file, and besides it is very straight forward as XML was designed to be human readable as well as machine readable.
First, you need to locate the configuration file on your hard drive. See below for the exact location as it depends on your operating system version. Once you found it, it is important to make sure the application is not running, otherwise it will overwrite your changes when you exit it, and everything you did will be lost.
Once opened, locate the particular option line you wish to change, as described in the following pages. Options are in most cases of the following form:
<OptionName type="value" />
Where "OptionName" corresponds to the option you want to change, "type" is the type of configuration variable and "value" a value of that type. The variable type (and the possible values when relevant) is always specified in the description page, but "bool" type variables can take only two values: "1" or "0", "uint" type variables can take positive integer values, and "real" type variables take floating point numbers (ex: "3.14")
When done, save and close the configuration file and restart the application.