Hi Doug.
So, let me see if I got it right: You want to have people be sent to the homepage after logging in, is that it? Or what do you mean by "S2 Member wants me to designate a Login Page"? I imagine you're talking about the Login Welcome Page, the one where people are sent after logging in. And yes, this would be a protected page that people not logged in would not have access to, so the homepage doesn't work for that.
If I understand your problem correctly, may I ask why you don't want to create a page that will work as a Login Welcome one, where you can talk to the member as a member, and not in the general terms you have to use in the homepage because those are open to everyone?
If I didn't understand, could you please explain it some more? Thanks!