Thank you steve. I wonder how i missed these as i read and applied your tutorials on attribute based permissions.
For automaticaly inserting and updating i'm thinking of creating a custom field template. This way i can also enable admin role to change ownership of other users' records.
For hiding in filter repeater, your tutorial solves it with just one if statement added to page template.
Thank you. Next time, i'll re-check all your tutorials before posting ;)