WordPress.org

Will this plugin works in WordPress older than 2.9?

No, because this plugin uses the post thumbail function added on WordPress 2.9.

Can I use this plugin for setting featured image using some image not attached to the post?

No. This plugin uses only standard WordPress functions to set the featured image. And using this standard (and friendly) method WordPress simply has not any knowing about images not attached to the post.

Is the post thumbnail and featured image the same?

Yes. When I released first version of this plugin, this featured was named as post thumbnails, but later WordPress team decided to change the name to "featured image".

In fact, WordPress core functions for featured image, still uses original thumbnail names.

That's because the plugin name (that can't be changed in the Extend directory without having issues) says "thumbnail".

Why you did this plugin?

I did it to fullfil the needs of many of my WordPress maintenance service customers.

Are you planning to add more features?

At first not. The main and only purpose of this plugins is to do what it already does right now.