OkCupid sets all of those up with match questions: you answer a given question, and mark what acceptable answers your "ideal match" would choose. The match percentage is calculated by comparing your answers to the other person's "ideal match" acceptable answers, and vice versa. The friend percentage is only calculated by comparing your answers to the other person's answers. But the set of questions themselves is the same, which means your "friend percentage" with someone can go up if you both like to be tied down during sex, or want to have babies, when these issues are clearly more relevant for matches than for friends.
It'd just mean using the matcher on people you wouldn't romantically pursue. I think there's too much of a stigma of okc being a dating site, so that people think using it as a friend finder would be weird.
People use okc to make friends all the time. This problem is pretty much solved for the 18-30 set. Now, how do you make friends in your 40's 50's or 60's is another problem.
They should re-brand it or do a spin-off if that's the case. OK Cupid, just sounds like a dating website, and I'd assume someone with a profile on that site is merely looking for a partner.
