I spent some more time working with "Roundup" this morning. When you create a new instance, one of the files it generates is
dbinit.py.
dbinit.py contains code to initialize the database schema, and also contains an empty
IssueClass class, subclassed off of the default
roundup.roundupdb.IssueClass. I was able to take advantage of this to customize the emails sent out by "Roundup" to make them look a bit more like the ones sent out by
Tracker (as mentioned in the "Python based Issue Trackers" post, Tracker generates the nicest emails of any issue tracking system I've worked with thus far).