I would like to be able to use the Archive function in the tools module and have it show only selected categories.

I'm working on a site where I'm using K2 to make both permanent content type of pages and blog type of pages (with different page templates) so I'd like to be able to put the Archive module on the blog pages and have it only link to items posted to the blog categories.

That would be great for administering more complex sites.
There is one more important feature I wish to see in next releases: possibility to show Item Author in archived items lists. It is important for magazine layouts.