Two shortfalls I am still hoping get addressed in the home screen.
1. Being able to lock a portion of the homescreen from sliding out of view. Kind of like MS Excel where you can lock say the top row from sliding out of view. That way you can ensure that no matter where in your home screen tiles list you are you can always see, maybe the top row or something like that. That way I could say lock the messages, emails or whatever is important to youa on the top row or two and know you can always see them no matter where in the list you are scrolling.
2. Some way of indicating where in the list you are, like a scroll bar. I have tried showing of my phone to two people recently and observed both people not knowing where in my list of apps I was. So picture having a long list and not knowing how far from the bottom or top you are and just scrolling up and down till they worked out where the top is. Actually the app list has this. Both small featurs, but useful.
Have stopped holding my breath for some kind of profile settings as well. Really miss this feature the most. All my old Sony Ericsson's had this built in, my Android has a great one that turns stuff on and off and does various tasks based on where I am. Really wish WP would get this.
I would live to make this as a developer, but sadly the API's don't allow me access to the stuff I need to make it happen. Hope the new SDK allows me, or that profiles is a new feature comming to all windows phones.