I prefer to run PE without the BT mod, to get the best from the new terrain treatments in PE. In fact, I'm not running any mods with the new PE version until there's more clarity from the mod makers themselves on what works / what doesn't. I did try the BT mod with PE and it does still seem to add a slight smoothness, but at a cost visually. Also, the occasional "hiccup" that occurs when terrain or other things are loading is actually worse with the BT mod on (IME).