If you give arbitrary power to those who enforce the rules, sure, they can fit in 100 pages. If you don't value predictability and consistency of enforcement, sure, they can fit in 100 pages. In fact, the rules can fit onto one page. The Ten Commandments are pretty short.
However, if you want to have a predictable body of law administered fairly, it's going to take a lot more than 100 pages. Even the Ten Commandments aren't that simple when it's time for practical application. You can simply decide on a case-by-case basis and not write down what you do, and then it will fit in 100 pages. But if you give notice to others about what your decisions are, and you are bound by previous decisions...well, that sounds a lot like a common-law system. Decisions in such a system are going to exceed 100 pages.
These things aren't as simple as it seems...there are good reasons why the Supreme Court once considered what it meant to "use" a firearm.