Awkward :-)
Figured it out 5 minutes after posting.
I had to turn off all the gestures, including tap in /mnt/us/extensions/WebLaunch/bin/config.xml
Code:
<kindle:gestures>
<kindle:param name="drag" value="no"/>
<kindle:param name="pinchzoom" value="no" properties="fire-on-zoom:1"/>
<kindle:param name="tap" value="no"/>
<kindle:param name="multi_tap" value="no"/>
<kindle:param name="hold" value="no"/>
</kindle:gestures>