Allow users to filter results with English text.
Have filtering use the dialog's progress monitor.
Move the free synthesis button into the debug toolbar and make it always shown.
This is suboptimal; I would like to hide it like the other debug commands, but I don't know how.  If you have the Handler you can call its setBaseEnabled method to do this, and you can use an IHandlerService to re-evaluate a propertyTester, but neither works perfectly.
Minor bugfixes.