First reported in http://forum.kde.org/viewtopic.php?f=217&t=110827
E.g., in Google Earth we can achieve this position (KML just as example, I'm not saying to stuff this into Marble.)
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Document>
    <Camera>
      <longitude>0</longitude>
      <latitude>0</latitude>
      <altitude>20000000</altitude>
      <roll>23.3</roll>
      <altitudeMode>absolute</altitudeMode>
    </Camera>
  </Document>
</kml>
But there is no way to make Marble view that position.

Reproducible: Always

Steps to Reproduce:
Try to tilt / roll marble.
Actual Results:  
Discovered its "two ears are anchored at the sides no matter what" (details in the above URL.

Expected Results:  
Marble should be able to view any arbitrary position. It is a shame as it comes so close....