JC,
Thank you for the reply...
Here is my reasoning for bringing up this concept.

I have been playing with 3 different texturing systems.

1. mtl_terraintex3
2. mtl_terraintex effect
3. Mysty mood terrain shader system

Unless their is a better way to add roads/streets???
I really like the fact that "mtl_terraintex effect" allows an unlimited number of tiled skin textures.
But, I thought that by using alpha channels I can use one skin for the roads but it would need to tile only once.... (the roads have lines etc and are not just asphalt)
Then as I have been adding sand at beaches, grass, stones, snow. cliff, under water caustic effect etc, etc... each with the tiling set at different amounts...

You are right in that "It would look strange if detail_size is different from terrain to terrain.
(Remember my projects use aywhere from 30 to 200 peices of terrain for the entire terrain.)
But, I find that each different tiled texture needs to be set at different ditail size... like sand at 200 grass at 300, rock at 100 etc etc...
but each terrain has each set identical....

Your thoughts are appreciated...
Thanks