Mit
visible true/false ließe sich das realisieren
$this->cacheCode('[php]','
<krpano version="1.17.4" onstart="startup();">
<layername="willkommen"
url="images/introimage.png"
align="center"
onloaded="set(alpha,0); tween(alpha,1.0);"
onclick="willkommen();"
keep="true" align="center" edge="center" x="0" y="0" url="images/introimage.png" visible="false"
onclick="set(layer[willkommen].visible,false);" />
<action name="startup">
<!-- load the first scene -->
set(plugin[willkommen].visible,true); if(startscene === null, copy(startscene,scene[0].name));
loadscene(get(startscene), null, MERGE);
</action>
</krpano>')