Several Image+ settings can be overridden using MODX System Settings. This allows you to change the behaviour of all Image+ instances accross your site.
Available System Settings
tvimageplus.debug- if true enables debug mode, which looks ugly but provides more info for developers;
tvimageplus.cache_media_source- The Media Source to use to store cropped images. Defaults to 1 (Filesystem)
tvimageplus.cache_path- Path (relative to Media Source root) to the directory used for storing cropped images. Defaults to