Ray,
I'm sorry to hear you are not happy with Nexudus. Those guys are great. Don't blame them for "inflexibility" as that is what is required when providing a polished product to such a wide audience. You could also see this as "structure" and I can tell you the lack of structure in Nadine causes problems of it's own. But she sure is flexible!
What you are asking for would nicely be addressed if we had better documentation. Unfortunately, that's not where we are at currently. I'm working on changing that but for now you just need to tinker with it, add some memberships, check people in, book a meeting room, generate a bill...
If you find Nexudus hard to use, you might not like what you find with Nadine. Then again, if you like to tinker, it might be just the right tool for you.