I'm not sure if auto-generated detail is a good idea. I'd rather add functionality to add detail based on real height data.
My plan ist to add support for the tool that Stainless is developing: https://www.sas1946.com/main/index.php/topic,60267.0.html.
A higher terrain resolution will also need extensive changes to the engine as the 200-m resolution is hard-coded in many places (I think).
There is an army saying "while enemies draw maps, we manually change the terrain".
I want to say, that real height data authentic for the present, not for different date, especially during and after combat operations
About 200-m resolution in hard-code... I have a sources of 4.09 version, and i see in it 200.0f (implied meters) in different places and constant in Landscape.java
public static final float PixelSize =200.0f;
public static final float PixPerMeter =0.0050f;
I don't know more about it.
Probably you're right.
PS And what about road rendering? May be is it possible to smooth road turns?
Yes, there are some long standing bugs concerning map_c, I will take a look at those eventually.
I wish you success, luck and pleasure from this business.