The thing that has always made me go "WHY?!" is the fact that there are multiple editions of the rule book. Coaches' Edition. Umpire's Edition. UIC's Edition.
I agree that there should be one, and only one version of the rule book. For example, does it not say in the UIC version that umpires should not wear jewelry (I've never seen the UIC Edition, but I could have sworn someone on this forum has said that in another thread)? Why doesn't the Umpire's Edition say that?
My suggestion: one rule book. Period. All the same rules and all the same Rules Supplements in one book. You'll have a lesser likelihood of inconsistent print between the two versions. If you're a coach, get the rule book a separate coach's manual. If you're an umpire, you get the same rule book with a separate Umpire's Manual. If you're a UIC, get the same rule book and get the separate UIC manual.
I'm still waiting for the Fans' Edition, but I guess that one is always subject to change.