Newbie here, just getting started on L3DT, so maybe there's already a way to do this. The Perlin noise tool is great, but it would be nice to have a version that only raises the elevation (similar to raise to). Conversely, a lower-only version for things like canyons, oceans, etc.
Great software, by the way. Finally -- an editor that doesn't require a PhD or half my life to learn how to use!
Ed