More options to speed things up

Hi there,
Since D5 is Unreal based why is it so much slower when rendering an animation or even an image?
It would be nice to have more render-options so i can speed things up. Certain features really aren’t that obvious when animated but really slow down the rendering.

Also, often some parts of my Sketchup model are not selectable with the materialpicker. It looks they are locked. although they are not. What could be the case?

And finally, is it possible, when painting with assets (like grass) to only paint specific faces of the model (so they don’t get painted on other parts that are close? Reducing the brush size is an option but time consuming (and not always working).

Till when is the discount availible?