Hello.
I think you've come to the right place. Look how it works. The cops and gangsters walk on a special grid consisting of points located on the terrain. This grid is stored in the file check.bin, which is located in the mission folder. This file is in Freeride, and in Freekrajina it is not. Therefore cops AREN'T WALKING to Tommy in countryside.
In folder MISE16-KRAJINA is check.bin with a grid for countryside. Take it and put it in Freekrajina. Then the gangsters will run along the roads.