You know what, after 10 years of Tivo use, I also never noticed this! However, my wife, who does most of the scheduling manually (I mostly rely on my many SPs and WLs for my stuff), when I asked her if she knew about this, the response was, "of course, durrrr!" (that's me told )
The SP to WL module will be a godsend here! (my "important" stuff are mostly on WLs already anyway)