Ahh... will we ever really know if SuperThrive "works." I read the part about ST on sarracenia.com as well, it was informative. However, there is so much testimony from growers that ST kinda sorta might be beneficial, that I use it. To the best of my knowledge, one of the things that ST does well is it helps with root development.
There is little evidence of ST being harmful to the most species in the Nepenthes genus in small doses... if I suspected otherwise I would not use it.
Do some experiments if you can afford to. I am unsure of misting with superthrive.. I believe Savage Garden mentions it, and a few other sources have mentioned misting with superthrive. Misting Neps with fertilizers, as far as I can tell, is not a bad idea. Many people recommend that method as opposed to subjecting the roots to fertilizer... less potential for plant loss I guess. But then again, many people soak the roots of bare plants in a ST solution when transplanting.
Personally if I am simply using SThrive as a supplemental fertilizer, I use 1-2 drops per gallon. If I am using ST as a "treatment" for repotting plants, or if I am trying to make a "big move" a little less stressful (ie, after the plant has been shipped somewhere or came home from store) I would use the 1TEASPOON per gallon mixture.
Start small. One reference I use (if using ST as a fertilizer) is that the water should just BARELY (if at all) smell like ST.
By the way -the algae in my chamber LOVE superthrive as well.