I have a Borneo STP and a chrome-headed Sumatran STP and they are both not feisty in the least bit. Except for feeding time, then they hit REALLY hard and REALLY fast. It is supposedly really easy to overfeed these guys, from what I've read, so I am erring with smaller meals. (But I tend to do that across the entire collection)
Mine are mostly sedentary with the only movement being pupils, except after eating, then he'll go drink some water, and then go burrow on the warm side. I provide thick layers of substrate because they enjoy burrowing. And a large water dish to soak in if desired.
I keep my humidity up around 70% and ambient temps around 83* - You just have to watch that enclosures do not get too cold or too wet. When soaking them (if ever necessary) be sure to replace the water when it gets cool, or do shorter periods of soaking in warmer water. I do not like to let their body temperature swing too much compared to some other more tolerant species.
I enjoy mine IMMENSELY, but I don't think it could serve as a replacement for a snake that's built like a Retic - it's just different.