Unfortunately a followups-to-user-selection feature would take far more than a couple hours to implement properly. The user table and more would have to be changed, which I'm keen to avoid for the very next release, if possible, to prevent breaking plug-ins.
There are a lot of things on the table for the next update already so I cannot put a rush on this one.
I will reiterate my previous offer of a script to create a new list out of a user selection (this could even be done on a schedule, such as just before dailymail) so you can do as you wish with just about an hour's work.
Regards