I will update the available length in the dbFront setup screen in the next release of dbFront. That would be a 1.0.15 release.
For older releases of dbFront you can save what you can via the settings screen and then open the dbFront Service config file and manually update the config entry.
The dbFrontService config file is found in the folder c:\program files (x86)\dbFront and is named dbFrontService.exe.config.
The key and value you want to update is: SSOApplicationId.
NOTE: If you attempt to save a subsequent change then it is possible that the application id may be truncated.