While many of the The Zone Reclamation Project's features can be configured with Notepad, the included Modifier program can be used to customize your game with ease.
Don't like head bobbing? Want to change the time limit on quests? Or perhaps you liked Snitch's chatter, and want to turn it back on. You can do that here.
Special Smart Mod Manager Note:
If using the SMM, you need to configure the ZRP before installing the archive via SMM. The Smart Mod Manager changes the spacing when it merges mods with the vanilla files, and the Modifier is looking for exact matches in some cases. In other cases, SMM doesn't copy the original file to the STALKER installation directory because it is the same as vanilla (prior to configuration).
You can also manually copy files and/or edit the configuration files that report mismatches. In the future, configuration files that take this into account will be released.

Some ZRP options
The Config Notes button will display help in your text editor for the specific configuration file selected in the drop-down combobox at the top left. The Help button brings up general help for the Modifier program.
You can Apply your changes, you can Revert to the original form (warning: might undo other file-related changes) and you can restore the Default ZRP settings for each individual entry.
Hover the cursor over a field or checkbox text to see a pop-up hint about the option.

A possible configuration
Note that you can have both checkboxes and fields for the same entry.

You can modify settings for Marked One.
You can have more than one configuration file. An actor.cfg file is included. This shows off a File Choice option.
The Modifier program uses simple text files containing MS-DOS .INI configuration data. You can easily make your own to help you tweak your custom settings. In fact, modders are encouraged to do so; the Modifier program can be freely distributed with mods based on the ZRP.