Well, your plugin seems prety cool. I personally am intressted in such admin features that makes it easier to manages things whiout getting into each post/page or so.
However, I blieve it could be more practical if you could place the post status in its own column. Best placed before the titles in its own column to be sortable!
You may also considering doing the same with thumbs. Forinstance if a post or page includes any images or featured image, so it could be displayed as thumbs in post/page lists.
What do you think about my feedback ;)?