Changes smaller things that are issues for either Minetest or Minetest Game that are technically fixable but won’t be fixed due to several non-technical reasons.
All configuration options are set to values intended by the redefinitions. For changing or disabling the values set the corresponding options to the preferred values or to the value that disables the redefinition.
The configurations can be set in the global minetest.conf file as well as in a world-specific configuration file located at ./worlds/worldname/_redef.conf. Global settings overwrite the given defaults and world-specific settings overwrite the global settings and defaults.
Very usefull especialy for building and graphics
Nothing to say except "INCREDIBLE" :) I like especialy stairs graphical tweak.