I think most of you will remember HTC Leo which was then announced to be the same HTC HD2. Earlier we though of it to be the first Windows Phone 7 device, while at the end it turned into a rumor. And at the end the device came up with the absence of some interesting features. For example HTC HD2 had to come up with a ROM feature of Pinch to zoom in Manila, known also as TouchFLO 3D or HTC Sense.
The feature would allow the users to get an access to a special part of the TouchFLO without the soft keys disappearing. This would be cool.
Anyways this feature cannot be called a day-to-day feature, I guess that’s the main reason it was removed.