I will submit a PER as well, I was able to do this with ArcSight, but have not found the same functionality with NITRO as of yet.
This is available in 9.3.x as a New Feature - no need for a PER
Did you really mean 9.3 ? Do you have a list of items that will be included in 9.3? It's my opinion that watchlists in Nitro are lacking in functionality. For the scenerios mentioned above, having a flat file of only one item (in this case a list of IP's) is not that helpful. It would be nice if the alert also added the date/time stamp, nnumber of occurences, domain lookup, etc. It's all about enriching the data.
Current version of McAfee ESM is 9.3.1. 9.3.0 was released in September 2013, and it does indeed include the ability to age entries off of watchlists. See the link below for the 9.3 release notes.
As an aside, in case you're not aware, you can get notifications of ESM releases via the McAfee Support Notification Service (SNS).
Thanks Scott, I see that I now have the ability to age out items in the watchlist, so that is a start. It does not appear that they added the abilty to append the date/time stamp field from the alarm. I am using the alarm to append to a WL, but the date/time last seen or added to the WL would add a lot of value were I to export the WL.