Plugin allows to select category which will be used to generate permalink on post edit page. Use custom permalink option %scategory%.
Permalink option of WordPress
%category% has one great limitation –
when this option is selected, WordPress uses category with lowest ID for
permalink generation. This plugin is intented to bypass WordPress permalinks
limitation and allows you to select category for permalink generation.
If you have any suggestions, found a bug, or just wanted to say "thank you",– feel free to email me firstname.lastname@example.org. Promise, I will answer every email I received.
If you want to contribute your code, see the Development section under the Other Notes tab.