hope I'm not too late to add my two cents...
Alot has been said that i agree with, usually don't know what I'm looking for other than catagory... tree, people, cars, etc.
being able to set preview icon size would be nice, either all of them or if nothing else a selected item enlarged preview..
one of my pet peeves is it always defaults to placing multiple items of the same item... well in general you don't want more than 1 item in a scene, (ie person, car, etc.) ...maybe having check marked a number of items for a multiple individual insert would be cool....(like a list)
upon placing the item having it prompt for rotation would be nice (or at least the option to do this). An auto jitter/scatter would be a nice item for vegetation..
like random size, rotate, and displacement when placing trees. Fuller (denser) trees and bushes are needed. definitely more shapes and sizes of bushes.. cant get enough.
and as stated above, being able to change color/material for an item would be nice.. for example there is a very nice illuminated bollard, but cannot adjust light intensity, and color makes it less than useful.
all your vehicles look the same. i bet there is at least 12 cars that if placed side by side would look rather identical. having more range in types (make,model,year) of vehicles would be nice. more trucks, suvs, etc. almost all are small round nosed cars.
maybe even a drag and drop mode from the palette into the model would be great. that would speed up import. quickly grab, drop and move to the next.
really need more handicapped people... half the time spent on plans is too meet ADA codes (stairs, ramps, counters, etc.).. might as well show it being used.
LOVE they way you ask for your users input.. keep up the great work.