You can detail your terrain in various ways in WM.
You can either just add some fractals to it which adds more sauce to your terrain which you can then erode further.
What you can also do is:
1) open a new project
2) in project world settings change the main extent from 8x8 to 16x16 or even 32x32km.
3) load .ter file with file input device and use the quick scaling tool to fit the 16x16 or 32x32km extent.
4) detail a tiny bit with and expand the terrain with the expander, but use very small amounts to just create a slightly larger starting "volume" to erode away.
5) erode using both filters (avoid sharp artefacts, so do NOT use inverse filter and set interpolation to smooth instead of linear)
6) calculate the thing @ 4k or even 8k if memory allows (preserve memory function is king)
7) export all erosion maps and heightfield
Import all the stuff into TG and use the erosion masks to mask TG PF displacement and strata.
For example, exclude strata from erosion channels by inverting the "flow mask" from the erosion device.
(thus use "invert mask" in the strata shader)
Why do I resize the terrain extent to 16x16 or 32x32? Because I feel WM's erosion has a kind of fixed resolution.
In a 2x2km extent the erosion channels are small, sharp, straight and deep, while in a 32x32km extent they are more organic and the erosion channels "start" in lots more places.
In overall I feel you get more detail this way.
Anyway, a lot of info...good luck
