The plugin doesn’t work with no role users at the moment. However, I believe WordPress itself will allow you to get the same functionality.
I don’t have a multisite install setup to test on right now, but I’m pretty sure it works the same way as a standard install. If a user has been set with no role, then if they log in they will be redirected to the site’s home page by default. If the user then manually tries to go to wp-admin, they get the message:
You do not have sufficient permissions to access this page.
As far as the toolbar, you’ll have to uncheck the setting:
Show Toolbar when viewing site
for the user if you don’t want to have the toolbar show for that user whey they’re on the site.
