Config.json settings

Config.json is a file created by Terraria that primarily stores settings that were chosen via Terraria's settings menu. Config.json resides in one of the following locations by default:
 * Windows:
 * Mac:
 * Linux:

Hidden settings
In addition to storing the in-game menu settings, config.json allows players to set certain game options that have not yet been added to the menu. In order to set these options, quit Terraria completely, open the config.json file, edit the desired settings, then save the config.json file and start Terraria.

false, or true, (default: false)
 * When this is set to true, the World Seed and Texture Pack features are enabled.

false, or true, (default: false)
 * When this is set to true, Smart Cursor will activate even for common block types (1.2.4's smart block placement will be re-enabled).