I would write it different:
Photosynth is very, very good to balance light and colours; I would like my usual softwares for panoramic view could work the same (photostitch, autostitch and other); So, don't care about aperture und use an automatic program; just change the ISO if you are working inside and have no tripod.
I just made a test because I was disapointed by a point cloud: that is:
outside (garden, architecture, monuments) my pics are 1600 x 1200 (2 MPixels) and before synthing I divide them by 4 (that is 50% on each side) to 800 x 600 (1 minute for a 100 pics with PhotoshopElements); that's enough for a nice visit, or for the view on a computer screen; and I have no more memory-problem and it's so much FASTER for merging the pics and for uploading them ...
So now have look on my CITYGIRL (search this tag) and view the difference: not so much in the normal view but a much better cloud.