I think it maybe a good idea to have the ability to lock specific sections of the crew.

Say that people like to do their own thing in the Art crew with dividers or for those that simply don't like specific art crew credits, say the Visual Effects credits. Well they can lock the Art Crew from further updates, but when they do download an updated profile the other crew sections would be updated since they were unlocked but the locked Art crew would be unchanged.

And to go a step further, perhaps have the ability to only contribute certain sections of the crew through the use of a checklist of some sort. So let's say someone updated the producers section they can upload just that section of the crew.

I would also be happy with partial locking or submitting of crew but also of cast. Sometimes I need to manually enter data I should've been able to download because part of it overlaps with what I already entered.

+1 

Agree with north.