Arrow display in overlays as an option

At this time the arrows displayed for directional results types such as the Water Overlay’s direction result type, are limited to those built-in result types. All other Grid Overlays will use the default display styling for interpolated colors related to values. Therefore I need to access the results in an alternative GIS package such as QGIS, which offer more options for adding specific styling rules to your data. Would it be possible to make this an option? In my case this is usefull when I want to modify the Water Overlay’s direction result type with the combo-overlay.