The main window for ksconfig grows taller as additional partitions are addded to the partition information (hopefully already fixed in cvs like the other couple of bugs that I just filed :)
Unfortunately not. I plan on fixing this soon, though.
Fixed in CVS. I added a scrollwindow around the partition list and made all the windows unexpandable so that if you want to see the entire partition list you can increase the height of the main window. The window doesn't resize if you add more partitions.