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Cross focusing units for larger veiwing fields and collage

Ok, Here's part 2. I've only got about 12' of throw distance from the units to the projection surface. And of course, budget is a issue. I have only seen the collage effect work if the units are relatively focused straight in at a 90º angle from the unit to the projection surface. Is it possible to cross focus the units to make the fields larger and correcting the keystoning (which one has to do when using collage) thus using fewer units to fill in the space?
I understand the percieved brightness of the units will diminish from one side of the projection field to the other. My question is will collage work in this scenario?
I am assuming that it would as long as I tell which unit goes where in the collage set-up window. Any takers for answering this "riddle me this?"
Thanks
Jay
JGLD, Inc
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    There is a limit to how far the cross thought will work. If it is a very hard angle then the keystone just can’t compensate. Also you need to keep in mind that when you use the Collage function you will be using the keystone to make a 3X4 image and this will make the image smaller also. I do not know an exact number, but I would say off the top of my head you can’t go much more then 45 degrees, it might go a little further, but I do not think so. And I think 45 degrees is pushing it.
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    There is a limit to how far the cross thought will work. If it is a very hard angle then the keystone just can’t compensate. Also you need to keep in mind that when you use the Collage function you will be using the keystone to make a 3X4 image and this will make the image smaller also. I do not know an exact number, but I would say off the top of my head you can’t go much more then 45 degrees, it might go a little further, but I do not think so. And I think 45 degrees is pushing it.
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