User management

Hello,

I have some questions regarding user management in Omeka.

I have been adding users to Omeka, and I wanted in some cases to add users to manage a specific collection.

There are 4 levels available: Super, Admin, Researcher and Collaborator.

Researcher can't edit itens in collections, Admin can edit itens in any collection.

Is there a way to give permition to a researcher to edit a specific collection that already exists and was created by someone else?

Thanks

Filipe