I would ideally like to be able to nest categories to a greater depth than Graffiti offers.

Is there any particular reason why only a single level of category nesting is possible?

I agree with tooke10's request for more category posibilities

It would also make Graffiti even more SEO-friendly.

I would add a request to extend the custom properties funtionality so they can be assigned to sub categories and not only to main categories.