This plugin will let you clone screen options from one user to another user or user role.

Create a shadow system of blog-specific screen layout options in a multisite environment.

Make your Screen Options and Help tabs more noticeable.

A very simple plugin that shows a thumbnail of a post's featured image when you are in the Posts/All Posts view mode.

Yes, it does. You can change the number of columns on both admin dashboards. ( site dashboard and network dashboard )