Unfortunately, WPL plugin uses ‘administrator’ role instead of some user capability in order to protect its menu.
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Only users with ‘administrator’ role have access to this menu. It’s not possible to change this editing user roles.
If you send me this plugin copy, I will look into its source code. Some plugins add custom filter, which allows to change how menu is protected.
Workaround:
1)replace ‘administrator’ at plugin source code with some custom capability. Contact plugin developers in order they consider to make the same change with a next update.
2) “Admin menu editor” WordPress plugin, which allows to replace ‘capabilities’ which used during admin menu definition.