Hi Rajah ,
yes , I do use latterite in my soil mixes for nepenthes. I use it in association with giant tree-fern roots I've found on some islands...
I breaks the root in little 1in long pieces , I fill my pot with that medium , add , the plant , and at least , I give a good "handfull" latterite to the pot....:0
Ok , it sounds barbarous , but that's the way I'm rooting all my Neps...
After 2 years , the soil mix is still there...fern-tree-root is were stable , and a little laterite-add per year is all the "care" I give to my soils...
Hope I helped
Patrice