Edit posts and postmeta in the Customizer. Stop editing your posts/postmeta blind!

Featured Image Reminder will display a confirmation dialog box if you press the Publish button and the post doesn't have a featured image.

Multisite Featured Image changes the box of the featured image so that you can use the classic Media Uploader also with Network Shared Media.

Post Featured Icon: Add font icon to post title, replace featured image with font icon. Currently it supports dashicons, genericons, font-awesome.