Thanks Oshyan,
Wireframes for objects as long as they could be controlled on a per object basis or user defined object group, would be very helpful in object placement terms I can think of object orientation as one such case, visual information that cannot be gleaned form a bounding box.
My concern about them would be selection if there is multiple complex objects in a scene and the object want for selection is blocked by one in front of it, short of having too do some thing as unfriendly (From a user experience perspective) such as having to move the camera view is not needed, if the selection could be made via the mouse scroll wheel or some such means then it would be of benefit.
The ability to dynamically change between bounding box and wireframe would be useful, a user experience case would be, an object is loaded into Terragen.XX (Insert Version number with such functionality here) as its default the object is loaded in as a bounding box, as now, or have it brought into terragen and displayed as a wireframe directly (Maybe a preferences option) by default objects are brought in as bounding boxes (This behavior should be clearly stated in both the change log for that version and the entry for that feature in the documentation).
For speed of preview display bounding boxes would display faster than the equivalent wireframe one, there should be an automatic behavior of all of this and that is terragen should either CPU and/ or System Memory resources become critical, then all objects currently displayed will automatically return to the default bounding box state (This behavior should be well stated in both the change log and documentation, my recomendation for the documentation is that the aforementioned behavior be set out at the top in centered text, and that this text be in bold.).
Just some throats I've had on such matters since my Bryce 5.5 days.
Regards to you.
Cyber-Angel