If you want to add random events between Squad Mode games, you can.
This functions similar to the in-game event deck but is drawn after you finish your battle and can affect progression, equipment and even the next battle you fight.
One question that's come up is regarding Linear obstacles.
As written, a character must cease moving immediately after crossing a Linear obstacle.
This can get a little stodgy when a character is right behind a low obstacle and using it for cover, for example firing from behind a line of rubble.
If the terrain doesn't reach above, say, the figures knees, I'd say let them move across without penalty if they begin the Move action in contact with the obstacle.