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

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

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.