That's a good list, and whether they can actually answer all of them is debatable, but the way they answer will say something. If they look at #20 and go "sure, we can do anything", you know they haven't really thought it through. Or if they say "we won't do that", you have an idea of how flexible they'd be.

A few of these apply to any partner, so I'm not sure they're fair questions, but they would be good to ask, just to gauge how they're handled.