Seems like the scripting options of the base S2 pack are really limited. Good for newcomers and Doom3-Cloners, but you need to proof me that you can make all kinds of games with it.
graphics and shadow rendering capabilities seem to be awesome, though it looks a bit hard-edged.

@expert: Then you would force anyone to use blender and build the models for the engine's requirements. I prefer a universal game model format like x or fbx, maybe collada (collada can be transformed seamlessly into fbx ad back). and the blender format is in constant motion, like the c4d files... hard work to keep it up to date.