I'm looking for software that can perform local adjustments in DEMs with tools similar to paintbrushes used in graphics editing programs but streamlined to respect geomorphology.
To give you an idea of what I have in mind check out this video of SimCity 4 terraforming mode. I would give a lot to have such a tool in ArcGIS environment.
Any local DEM modification in ArcMAP is a hassle.
Let's say I have a DEM with river bathymetry imprinted in it but there is a river port along that wasn't covered and has the height of the water surface (that's the usual case with LIDAR derived DEMs - water bodies are filled).
The only information about the harbour is the maximal depth. So to transfer this information to my DEM, I erase the entire harbour area (null values), imprint a small raster with maximal depth in the center of the harbour basin and then I fill the remaing null cells with a moving window filter.
The results of this operation are usually sufficient but the whole process is complicated. If only I had a "lower terrain paintbrush" :)