For custom images to be useful, you need to be able to change their package content (adding and removing packages to / from them).
Created attachment 2638 [details] Design - Editing package content in custom images
Created attachment 2881 [details] Design - Editing package content in custom images Describing the interaction of the 'required by' button for packages included, and what happens when you remove packages from the 'packages included' table.
Created attachment 2918 [details] Design - Editing package content in custom images A small change in the presentation of packages brought in by dependencies (see pages 3 and 6)
Image customisation feature now merged http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=30c132bc4726be90fadee419a588a8b8f2161380
Verified as part of 2.1.rc1: 296dfbc9b3a3c0ed64b8e748c2868928b9c2aa8b