The LaserWriter driver 8.1.1 driver uses a Preferences file to store Envelope Feeder option information. All LaserWriter 8.1.1 drivers (regardless of what you name them) look to this file for option information, so there's no way to save settings independently.
A possible workaround is to use both LaserWriter driver 8.0 and 8.1.1, as it seems LaserWriter driver 8.0 stores its information in the LaserWriter 8 Preferences file differently. Of course, you don't get the benefits of LaserWriter driver 8.1.1 on one printer.