One thing I'll note is that we do support importing contracts on customer paper / or deals executed outside our system. We only have a subset of our features for those, but all of your contracts can be together in the same system.
On the options making sense together, the standard agreements are created by 40+ attorneys specializing in tech law and commercial contracts. They design our contracts to reflect what is industry standard with a focus on creating a fair and balanced starting point. That being said, each company chooses how they want to configure their own cover page. We provide tooltips and help articles on what the terms and variables mean, and companies can work with their attorney to set it up initially or include them in the workflow. We can intro our users to attorneys who are familiar to with the standards and do good work.