I'd like to bind rotate around viewpoint to mouse button 4 plus left/right motion (and no zoom axis). I can bind it no problem for rotate around cursor (which will do in a pinch), but the same thing doesn't seem to work for viewpoint. In both cases it displays properly in Menu/Gameplay/Controls but it doesn't actually work.

<!-- NB doesn't work under 1.1.0; does work as a "CursorZoomRotate" binding, though -->
<binding name="InertiaZoomRotate">
<button>
<device>mouse</device>
<offset>4</offset>
</button>
<axis>
<device>mouse</device>
<guid>GUID_XAxis</guid>
<positive>true</positive>
<sensitivity>0.001</sensitivity>
<axisid>3</axisid>
</axis>
<axis>
<device>mouse</device>
<guid>GUID_XAxis</guid>
<positive>false</positive>
<sensitivity>0.001</sensitivity>
<axisid>4</axisid>
</axis>
</binding>