Since geoexplorer is giving us problems, we have started using QGIS to style our layers and then put the sld in geoserver. The wellknownname for a square comes out as 'rectangle' from QGIS and geoserver doesn't recognize that. There is a team that has to do styles this way and would prefer to find a way around replacing rectangle with square every time they do a style. Can I get geoserver to recognize 'rectangle'?
This issue was worked on during the OSGeo code sprint in Bonn. There is a pull request, that should be acted on soon: https://github.com/geotools/geotools/pull/1288/files It adds rectangle to the known shapes.