Cluster execution settings and flow variables

We are evaluating KNIME execution on a high-performance computing cluster with the SGE Cluster Execution plugin. When this plugin is installed, each node has a KNIME Executable tab, under which settings for the SGE job manager are specified. The fields under this tab do not appear to be exposed as a flow variables. We are likely to need dynamic access to set these fields, specifically the "Arguments for the SGE job" field, rather than setting them manually each time the job is run. Is there a way to set the fields dynamically, aside from writing directly to the node's settings.xml file?