This mod makes several adjustments to the map.
I changed the map_heights.tga and map_roughness.tga, so the terrain in SPQR is more smooth, and there won't be so many battles fought on ridiculous slopes.
To install, extract the files in the zip to your world/maps/base folder. Delete map.rwm, and then start a new campaign. The changes are NOT savegame compatible.
The original files are also included as backups so if you want to revert back to the original map, you can do so. Just delete map_heights.tga, map_roughness.tga and map.rwm, rename the map_heights_backup.tga and map_roughness_backup.tga to map_heights.tga and map_roughness.tga, and then run a new SPQR campaign, or load an old savegame from before you installed this addon.