2013/04/22 Version 1.0.1
* Fixed category list on administrator showing dashes or numbers
* Added Joomla v3.x compatibility
* Added functionality due to changes on K2 database query after v2.6.3
* Added functionality for User page (blog) option filtered by category
One suggestion that might add a lot to K2 is would be the ability to synchronise K2 tags with K2 additional categories.
I'm very grateful for this extension, since it really helped me solve some problems!
Extension itself is great, it does exactly what it says. Installation is super easy and no core files are hacked just great.
Not only extension was great but also documentation. Everything was explained very well and developer also has included suggestions for some common problems that might occur, which is amazing, since not a lot of people think about these things.
It seems that this extension is even better than some paid alternatives. I will definitely be donating soon!
Additional categories that you have assigned to items with this plugin are basically secondary categories. The primary category is the original K2 category. You can only have one primary and multiple secondary categories.
Items will keep the URL structure of the primary category to prevent duplicated content.
Why this feature isn't already in the K2 core is beyond me.
Note: If you use Joomla 2.5, there is a chance that you can't see the additonal categories in the backend. However there is a fix in the support forum available.