Да,спасибо,это R.
Что касается на счет проходимости,то это 6 пункт -
6. Last tweaks
Most of the work is now done, it’s time to put the finishing touches to the map.
In the Terrain painting panel, you’ll find a drawer named Passability. It allows you to set some tiles as impassable, thus better controlling where the players can move or not. As for the Area of Control painting, you can press shift while clicking to ”unpaint” a tile.
You can also set some tiles as ”water”. It means these tiles are only available to Sanctuary heroes or boats.

То есть,надо ставить на лаву,к примеру,красный цвет?