In my testing it worked. Will note that the space you need to put in can differ quite a bit depending on the type of camera you are using and it's position. I had the following in my test theme and was able to see the property function.
<coverFlow:FlowControl x:Name="FlowControl" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Column="0" CameraZPosition="3.0" VisibleCount="14" PageSize="6" ItemSpacing="0,-1" SelectedItemZPosition="2.0" Columns="1" SelectedItemSpacing="1,2">
<coverFlow:FlowControl.FlowTemplate>
<DataTemplate>
<coverFlow:FlowContext>
<coverFlow:FlowImage ImageType="Clear Logo"/>
</coverFlow:FlowContext>
</DataTemplate>
</coverFlow:FlowControl.FlowTemplate>
</coverFlow:FlowControl>