Open Project - custom field authorization

[login to view URL] I would like to have a possibility to set group permission to view Custom fields for work packages (administration -> Custom fields -> work packages ) So if person belongs to a specific group he/she can view custom field otherwise not. Configuration can be done in text files, no need to change user interface is required. On attached picture there is a sample of fields that I would like to show only to people in selected groups. Do not forget that hidden fields must not be send to users by e-mail when work package/ticket changes. Configuration file should look something like: field_id_1:group_id_1 field_id_1:group_id_1 field_id_1:group_id_2