Sometimes I think I should have gone ahead and put in the effort to get the image climate shader working like I wanted to instead of just doing the cheesy thing that ended up in the software. Ah well...

One way to avoid the overly-smooth mountain chains that FT editing tends to generate is to use the selection tool to generate a squiggly area and then Tools>>Actions>>Create Profiled Mound From Selection. The result is analogous to the shapeburst algorithm in popular image editing tools.