Redmine

Debian Lenny
ruby 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux]
Rails 2.3.5
Redmine 1.1.0.devel (MySQL)
mysql Ver 14.12 Distrib 5.0.51a, for debian-linux-gnu (x86_64) using readline 5.2
Apache/2.2.9 (Debian)
passenger (3.0.0)

Redmine is up and running.

I want to be able to filter Redmine issues by "updated by"

I can already filter by the Redmine issue author but I currently don't see a way to filter by an issue updater. I ultimately want to be able to filter and view all issues created by or updated by a specific user I choose.

I see the Administration > Custom Fields > Issues section in Redmine but I don't think that's what I want because I'm not creating a new field.

I'm not sure if this is trivial or not. If it's trivial, where do I look to add the ability to filter issues by "updated by"?

If this isn't trivial what does adding this ability involve, what keywords and where should I start looking or reading to figure out how to do it?

Thanks in advance.