Answer
This isn't something fixable on the Developer Studio side — this specific plugin has a known, unresolved compatibility issue in plain NetBeans itself (the platform Developer Studio is built on), so it isn't usable even in a standard NetBeans installation, independent of any IFS-specific configuration. There's no supported workaround; the plugin should be considered unusable in its current state rather than something worth continuing to troubleshoot as an installation-step problem.