This would indeed be great to have; even a page selector when importing a multi-page document would be an improvement (the Adobe Illustrator version I've use had that; IIRC it would just leave all other pages of the document alone).
You should also test with PDF documents; in my experience Karbon 3.1 works well enough with them. >Ported to use pageapp classes. ... > A lot of code was duplicated between pageapp and karbon > and has been removed from karbon: Shouldn't that be a separate change - or does multi-page support come automatically with this change?