As far as I am aware, right now, when placing foliage actors, we only have the option to paint with a circular brush. Now, I have nothing against circles, oh holiest of shapes, but it would be awesome to have the ability to define a masked shape and paint foliage actors with it. Or, perhaps, the ability to have two shapes, and lerp between them to create some truly unique looking flora placement.
Also, is there anyway we can increase the speed of foliage placement? Sometimes my computer stalls for 10-30 seconds when attempting to place a large, dense circle on a given landscape.