In addition to sharing custom rules between projects I want to be able to enable/disable rules among all my projects. I currently have 5 active ND projects, so if I want to turn off, for instance, "Nested types should not be visible" for all my projects, I have to go uncheck it in each project. Every time I tweak my rules, I have to go repeat these tweaks in all my ND projects.
Some sort of meta-project rules management would be an enormous effort saver.
In addition, once a set of "standard rules" are decided upon, it would be nice to be able to create new projects and have those rules be the default.