Here's one for the wishlist (perhaps there's already a way to do this I'm missing).
Let's say I have a nice bitmap of a tree that has a trunk. It works great in my ForestPro scene except that I would like to have less of a trunk on many of the trees. Now I could make a new bitmap with no trunk or I could make a new surface object and make it lower in Z than the real ground object in the scene or I could move the pivot on my custom tree mesh... but the fastest way would be if ForestPro had an option to do a Z translation of all the trees. For example, the user would put in a negative value and the tree would drop below the surface and and a positive value would make it rise above.
Also, it would be nice to be able to give it a range such as -5 feet to 0 feet. In this way, the trees would be randomly placed in Z so some trees would have no trunk, some would have half a trunk and some would have full trunks.