Yes, wicks are easily implemented and your explanation is correct. Yet, I personaly haven't so far looked at them as something useful. They exist even in my grid bars, but only because it's so easy to calculate/add them, so I thought, why not. Maybe somebody finds use for them, one never knows... people have been known to do even sillier things like looking at moon phases and trade accordingly.

They can appear on any brick, but only on one side of the brick, by definition.