Deploy mock war on OpenShift

We are trying to deploy a mock as a war on OpenShift PaaS (www.openshift.com).

When war is deployed on tomcat, we have an error because OpenShift does not authorize write access on this directory (container model):

12:42:22,998 ERROR [PluginManager] Couldn't create plugin directory in location /var/lib/openshift/55ccd440e0223c04ce000150/.soapuios/plugins

On OpenShift there is another directory where write is authorized (/var/lib/openshift/55ccd440e0223c04ce000150/app-root/data : is there a way to configure soapui mock to use this directory?

thanks,

Cyrille