Moving things is quite manageable, but stretching would be difficult. If you want to make an object move intact you just group the points and move them by applying a bit of math to the lot of them. If you want to make a tree sway or something then you need to move the points within the group relative to each other by varying magnitudes which would be extremely difficult... though perhaps possible... depends how efficiently they can change their frame of reference (move and rotate the point 0,0,0).