Selecting the main category

Hey,

When I assign more then one category to a post then the oldest category gets placed in the url by default. However sometimes the newer category is even more related so I want that one in the url.

There is currently no way to set this and thus I was wondering if anyone knew a fix.

If you don’t really understand what I mean, then please say so and I will rephrase it.

Regards,
Martijn