Hey ... great hack (in theory .. lol .. as I haven't installed it yet) ... anyhow what would make it really great, is if you had a checklist of all the people who posted in that thread, and had the option of sending to those you checked. You could also add a [check all / uncheck all] box, as well as be sure there are no duplicate names.
Just a couple of ideas to make a good hack even better !!!