I have used still Delco autopop pgm with Zutis actors management tool because I was more familiar with it, working on my former map projects.
Here are some ideas for hints , as for how to avoid tedious cleaning the rivers and roads from unnecessary buildings after autopopping.
1. Place the rivers extracted from Mymap_c.tga downsized to map_T.tga, giving these rivers RGB 31, i.e. river banks. Do it before applying map_T to Delco pgm.
2. Similarly, place the extracted roads (as obtained by Nowekats excellent pgm), (giving them suitable RGB values) also to map_T.tga before applying Delco autopop pgm. But this might not work, as because map_T. contains the roads ab initio. Or how it can be prevented to get buildings on roads ? Perhaps make roads thicker, say, one pixel? Anyhow, not yet tested.
3. The map_T.tga so redrawn should be used only for autopopping pgm, the unchaned one should be used for the game .
These are my wisdoms on the stairs, lol.
I spent several hours by cleaning my present project map, only then these hints came to my rigid old mind. Perhaps somebody will appreciate it.