No, there is currently no such feature in the plugin.
As workaround you can remove the tickets from the cases (this is possible via plugin before closing cases or directly on the database if you're hosting it yourself). This hides the cases from the list, since they are then no longer seen as "public" cases.
It is planned however to extend the plugin some day to allow more flexible handling of the list, probably by using a (customizable) XSL transformation to generate the wanted output, so that you could handle sorting, visibility, grouping etc. via the stylesheet.
However, since the plugin is only an internal project which we shared with the FogBugz community because we though others might find it useful, I cannot give you a date when new features will be implemented and available. Sorry for that.