Hi Ulord,
Is something like this what you had in mind:
If so, what I've done is increase the 'peak overlay' setting to 100%, and reduce the 'fractal roughness' and 'erosion' settings to around 20%. If you want the exact settings, you can download the map definition from:
http://www.bundysoft.com/L3DT/downloads ... mo.def.xml
It's a ~3kb XML file. If you load it in L3DT using the 'File->Run batch' option, L3DT will generate the map for you, and you can see the settings used.
If this is still to steep, you can decrease the 'Altitude range' setting.
I hope this helps.
Cheers,
Aaron.