Description of problem: the way how "Customize" handling work is confusing - instead button, each changed row could be selected with some flag (for ex. icon), different color etc. + "all" button has lowercase 'a' in label. Additional info: This bug report is part of "System Configuration Tools Cleanup Project". Don't hesitate to ask project maintainers for any kind of help.
Actually the customize button displays changes you have made to the system. "all" has been changed to "All". Changes pending a commit are now marked in red.
Thanks!