I saw that the Cthulu Wars kickstarter campaign uses this (which I did not back, but someone on here mentioned), and apparently also allows late backing. MAYBE this is also a way for people to give via paypal (which some people have asked about), with it still going to the main kickstarter? I can't tell.
I've backed a number of projects, some of which were board games that involved questions like what sort of color scheme I wanted on my cards or whatever (Less: Like Chess but Less and Walls were the two main ones for me). I don't really have survey questions like that for the AI War II backers, except I guess how they want to be credited and what their forum username is. I think that Descent:Underground had a pretty streamlined way of handling that, IIRC, but I don't recall what sort of survey they used for that.
One thing that is concerning to me is that I see nothing about pricing anywhere on Crowd OX, which makes me worry it's pretty expensive.