I checked on this again for you and in our Access plugin you are able to restrict the Types custom field Meta Boxes based on the user's role.
If you go to Toolset -> Access Control and select the Types Fields tab you should be able to setup the permissions of your custom fields based on the user's role.
Thanks,
Shane
This ticket is now closed. If you're a WPML client and need related help, please open a new support ticket.