It can be surprising when items don't publish when you publish them. Even now that we get "Warning" status instead of Success in the pubtrans list, you can end up wondering what went wrong. Making the structure group visually different when not publishable…
It would be useful to have custom icons for Embeddable Schemas and Metadata Schema in the list view of Content Manager Explorer, to be able to differentiate these items.
If possible, the "Type" column should be display the full schema type (instead…