Is it possible to edit doodads props like unit's? (unit editor-style..?)

Also, can you edit the properties of doodads? Like the collision size (not the size they are automatically given when you rescale them, but I'd like to try and add the same "properties" buildings have to a doodad...an example : No matter how close together you build, your units will always be able to squeeze between the structures... ok, you can totally block an area with some structures, but you know what I mean, the pathing is smaller than the footprint, so there is some spacing - If I gave this to trees, units would be able to walk through a denser forest, and the big brush wouldn't place trees as close together as it does now).

I was hoping a 3rd party tool at the very least would allow me to do this...Any other way of getting more spacing between trees, without actually spacing them apart (cause then it doesn't look very forest-like anymore...)?

Thanks in advance (I'm starting to really like this board...prompt, accurate answers...which means dedicated people are roaming it...thanks go to them for letting me get some sleep, without worrying about the bloody map editor)

not to my knowledge but i will check it out thourough like! ;) get back to u soon