Is there any way to force which side of a wall a unit takes cover on?

It appears that each wall can only be manned on one side and I've been finding this aspect very annoying. I'ev even had a few walls where sections were different, so you end up with something like this if all units were taking cover.

.............................\/\/\/\/...............
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^^^^.^^^^.^^^^............^^^^....

It also means I rarely see a wall out in the field that I can make use of because it's usually the wrong way for what I need. For instance, there was a wall around a house which an enemy unit was occupying. I wanted my men to take cover behind the wall to shoot at the house, but they would only take cover on the house side of the wall.