Allow users to set a post author

I have a website owned by myself that allows people to submit work for us to publish.

I have a team of staff who need to create posts..etc
I have assigned users the author role which allows them to create posts but doesnt allow them to set a post author. I have tried setting them to editors but this doesnt work either.

Obviously i do not want staff to have full admin access so i am trying to control this.

I am using the capability manager enhanced plugin to help me control roles.

The edit_others_posts capability should allow users to set the author of a post.

At first glance you might reply that you don’t want your authors to be able to edit one another’s posts. The difference in ability is very subtle though: writing a post and then assigning it to another user isn’t much different from being able to write or edit that other user’s posts.