Upload Media Button only to user allowed to manage the content

[devilmind81]

Should be great if the Upload Media Button will be visible only to user allowed to manage the content.
At the moment if I disable the button with the variable:

UPLOAD_MEDIA_ALLOWED = False

it will disappear for admin and content manager also.
If I enable it with :
UPLOAD_MEDIA_ALLOWED = True

The users will see the button and only if they click will be noticed to be unauthorized.
I think that this could me introduced simply.

Thanks in andvance