A stand-up inverted coaster is possible...but it couldn't have inversions or the parks will need more medical personel than the Crystal Baeach Cyclone in it's day. There's only one stand up I enjoy, King Cobra at PKI. Not only does it make a nice, comfortable inversion, but it has an incredible helix, a cool trick-track, great bunny hops, and best of all, Airtime! Do B&Ms do that? I don't think so and I've been on Iron Wolf, Mantis, and Chang as well.
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Everything above was my opinion.If you disagree,please respond in an intelligent fashion.But before you post,I warn you that some people say I'm just too smart to understand. Please take that into consideration.