cincinnati, I plan on adding area avoidance in the summer, I'll pick a different useless dev texture and you can place that anywhere you don't want it to make brushes. Then if I really still want to work on it I'll add an option to simply omit brushes that would occupy the forbidden space, or to frame the forbidden space as well.
But even as it currently is, the small amount of fixing required is much faster than making the beams all from scratch or even copying and pasting from another area.