I just done d/l the multiterrain texture shader, but it just not fit what's in my mind...
BTW, this is the link for the video(but no audio tough, how do you guys record the game anyway, I'll I've done is pressing the F6 all the time...)

I still have difficulties in limiting the player movement, I did limit it via the normal of the terrain she will step on but is there a way to limit her movement with trees???