I'd love the ability to import animated trees blowing in the wind from Speed Tree. The trees are very realistic and the speed tree program offers the ability to animate the trees in various ways -- the most useful for architecture are the trees blowing in the wind. You can even purchase pre-animated trees other users have made. In Speed Tree you can control how hard the wind is blowing, what direction, etc.
In any case, this would add a great level of emotion to Enscape Animations. Cloudy day with overcast clouds looking like its about to pour rain and the trees are really gusting in the wind . . . or a beautiful sunny day with a gentle breeze just barely making the leaves move. Huge impact in an animation.
Here's the speed tree website with the link to the SDK they offer (I'm pretty sure this might give you the info you need). I know you can export the animated trees into 3DMax and Blender, so maybe the SDK info isn't needed : Speed Tree
Also, here's a terrific animation showing Speed Tree animated trees in action, love the feel the trees blowing in the wind add (great shots of animated trees from 0:19 - 0:38) : Architectural Animation with Trees