Feature request/suggestions welcome - tracking ACK's

Problem:
- a noc person ACK's a yellow for 24 hours and puts information into
the ACK about actions taken. When the ACK expires, the information is
lost (at least in the GUI)

Suggestion:
-be able to find whether an alert has been ack'ed previously, see the
ACK history, by clicking on the alert
-have ACKs show up in history

Alternative suggestion
-be able to look up ACK's in the event history report

I'm trying to train people to ACK instead of signing out but the loss
of info is a real problem

What are other people doing?
thanks Betsy