Know this is a little late, but want to let you know that I've marked this for the PM to review.
Good idea. For internal folks, we're tracking as #16882.
I don't see this in 10.0. Is it now in 10.1? This would help me out a great deal.
Sorting alerts by column has been added in the Message Center view in 10.1, but not in the Alerts view.
Hopefuly, the Message Center flexibility in terms of what is being displayed, can give you a similar view as the Alerts one (unselect Show Event, Show Syslog and Show Received Traps)
Hope this helps.
By the way, what would be your feedback if, in the future, we decided to deprecate the Alerts view and replace it by the new Message Center?
Francois Caron, Snr Product Manager