Better and More Foliage Tools/Brush Options

It would be nice if there was a way to use a square brush to paint foliage , as when I use circles , there is always over lap on previous circles and the foliage is thicker in those areas where they overlap , thereby having an uneven layout. And also from a height within the cull distance , you can literally see the circles. Or better yet, a volume box that can be stretched over a large area(on the terrain) and shaped the way you want it so then you can just fill it evenly with a click(like it fills the brush area).Or like the fill option does for static mesh , but for the terrain. Otherwise it is difficult to paint a large field evenly. Unless I am missing something.