In yum you get a list from packages extra installed on a system with the command "yum list extras". Would be nice to see this information in the Webgui.
Mass-aligning under space12, so that we don't lose track of this bugzilla. This however does not mean that we plan (will be able to) address this bug in Spacewalk 1.2.
Mass-moving to space13.
We did not have time for this one during Spacewalk 1.4 time frame. Mass moving to Spacewalk 1.5.
Aligning under space16.
This feature was implemented in Spacewalk 1.8. https://fedorahosted.org/spacewalk/wiki/ReleaseNotes18