Having used this focus feature in WYSIWYG I sorely miss it in Capture. It seems strange to me you have the command to export the focus as seen through the lens for any or all lanterns, but haven't implemented it as a focus feature?
I know about and use "Focus Selection", but its annoying having to navigate around the big selection box and the fixture itself to position the POV just in front of the lens, or to one side of the fixture.

Also, the output of the focus sheets is a pretty basic black and white image. I get you are intending it as a documentation tool, but the same feature in "Another Program" is pretty much like a colour photo, which is to my mind much more useful. 

cheers

rabbit