Discover 3? You can delete segments via "Organize segments".If those are from an user who left the company, an admin can impersonate that user and delete the segments. (actually deleting the user should do the same)

maybe simply fix the session management?http://ideas.omniture.com/t5/Adobe-Idea-Exchange-for-Omniture/Fix-session-management-in-SC /idi-p/1983If you've set the "remember me" check box you shouldn't even see the login page again. (nor the error page)

do a nslookup of your collection domain on a daily basis via a small script and send an email to yourself if it has been changed?

just click into the breakdowns field and enter 100 or 1000?

I can see the issue in SC, but in D3 you can select a single item. That's the most exact you can go.

both should already be available.Make sure to set s.linkLeaveQueryString=true; for 404 pages.and for the source, make sure the referrer is being passed.