I really like the idea of a macro texture, but with the size of current terrain texture tiles, the distance when the macro texture starts appearing is much too high for some game types.
It would be nice to be able to define the distance when the engine starts to fade in the macro texture, and the distance when the normal texture is completly replaced by the macro texture.

Also, I noticed no control to define the size of the terrain texture tile (independend from the size in pixels of the image)...
Giving the developer control over this would enable him to create crisp and sharp textures with small files by making the texture tile smaller, and would give people developing games with a cam some distance from the ground (RTS type games for example) the option to increase the texture tile size.