Even more so if about:config included a one-liner explaining what the option is for. Sprinkle search/hierarchization on top of the about:config and suddenly the rule can be "if 99% of the users don't need the option, it goes into about:config only".
The about:config window has a giant search box right at the top of it. It's not hierarchical, but its sorted alphabetically, so, for instance, all accessibility.* options are grouped together.
