The rules only apply so long as people agree to follow them. US Sailing has no army to enforce them. If you want to make up your own rules that say port has right of way over starboard and then invite all your friends to an event under those rules, no one is going to stop you. Similarly if you want to amend the rules as you see fit, no one is going to stop you. They may tell you that you can’t do it, but that’s about all they can do. It’s a classic case of "stop or I'll say stop again."