Unable to associate media objects with post without inserting them first

[C0BALT]

I think this should be in core:

This feature is necessary for:
Allowing people who write posts to select media from existing media without inserting it.
inserting a gallery instead of multiple images to a post.
Creating a gallery for a post where some/all of the media files are already in the media manager.
Where the gallery is automatically displayed with/in the post by insertion through template.
For people who are in charge of selecting correct photos for posts.

example:
If I have 420 pictures in media manager already
and I have 42 posts
and I make a new post #43
so, when I'm in post #43 editing it and I want to "attach" pictures 45 236 346 374 484 344 347 and 234 (8 pictures)
I can't actually do that.
I need to INSERT them all then remove the code inside the post.

This plugin does not solve (or work) with WP3.3B3 (Nov 17) this problem.
File Un-Attach
​http://wordpress.org/extend/plugins/file-un-attach/

Looking for a solution which has set of checkboxes in the media list
then able to select "ATTACH (not insert) all selected items to current post"

This plugin does what I am looking for.
Faster Image Insert
​http://wordpress.org/extend/plugins/faster-image-insert/

[SergeyBiryukov]

Related: #10657, #15127

[scribu]

Closing as dup of #10657. The data structure and UI go together.