Yeah I am aware of that as an option for custom assets prior to import, but as far as I can tell there isn't a way to do that for files that have already been imported or come from with the engine or an add-on pack, correct? It would be really nice if this were an option that could be tweaked in the vegetation settings for each item and a setting to have it randomly vary by some amount, it would really add a lot of visual variety without requiring more assets to be imported for each variation of depth a rock is pushed into the ground, for instance.