Mark,
To be clear, the change will not be in EngineDriver, it will be in the WiThrottle Server code in JMRI.
Check your WiThrottle Preferences in JMRI. There is an "Allowed Controls" section that can be used to disable the "Turnouts" functionality. Unchecking that does hide the Turnouts menu in EngineDriver.
HTH,
? SteveT
