I would make it so that any of the boxes that are networked to an HD DVR via MRV can see and adjust the recording schedule.
Customizing the banner colors would be nice, so not everyones looked the same (color wise), this also was done in older generations of D* recvrs, these were the ones that were out BEFORE D* Branded all thier recvrs.
Autotune on HR receivers, and instant skip forward and back instead of the scrolling skip they have now.