HC9000 Lens Shift
Both horizontal and vertical lens shift are motorized and controllable from the Lens Shift button on the HC9000 remote control.
The amount of vertical and horizontal lens shift is almost as good as it gets for a home theater projector
Consider, the maximum shift is 1 screen height in each direction.
Translated, for that 100" screen - which has a 50" height, you can mount the projector as high as 25" above the top of the screen to 25" below the bottom. That means you have a total range in where you place the projector of 100 inches vertically. Up to 50 inches above and below the screen's vertical center!
There are a few others with lens shift in this range, but most have less. It'a always nice to have available.
That takes care of vertical. for horizontal lens shift, you can place the projector almost as far to each side as the edge of the screen.
Remember though, using horizontal lens shift reduces the amount of vertical shift available, and vice versa.
HC9000D Anamorphic Lens
The HC9000D, as expected, support using an external anamorphic lens. For those without the budget, a 2.35:1 screen is still doable. The zoom lens has more than enough range that you can do what I've been doing with the HC9000, and that is using the zoom to fill the full width of my 124" diagonal 2.35:1 screen, for Cinemascope movie viewing, or zoom out, to allow 16:9 and 4:3 content to fill the vertical height with letterboxing on left and right. This solution eliminates the above/below letterbox found when viewing Cinemascope movies on your standard 16:9 shaped projector screen.
Essentially, you would be doing manually, what Panasonic calls Lens Memory on their PT-AE4000 projector. Not elegant, but it sure works (I've also been doing the same with all the projectors with at least 1.5:1 zooms that have been coming though here). Of course it's a lot easier with a fully motorized system like the HC9000D, than, doing it manually with an Epson 8700UB. Also, if your projector doesn't offer motorized zoom, focus and lens shift (wheras the HC9000 has all of those), such manual projectors are likely to be impractical for this, if ceiling mounted.