One thing you can try is raising the terrain to some power, then dividing down to get the desired peak mountain height. That creates a distinction between flat lowlands and rugged uplands, which I think is a bit more realistic. (You will have to abandon bathymetry by changing negative altitudes to zero, unless you want to be limited to odd integer powers.)

Not sure if FT can do stuff like that. Wilbur can, and I know there are guides to transferring data between FT and Wilbur.