- Moving items on the panel
Takes more mouse clicks, needs the additional panel options menu bar and simply dragging an application item from the menu doesn't work. Sucky.
Please add comments quickly, before they WONTFIX it: https://bugs.kde.org/show_bug.cgi?id=191376
- Configuration cluttered all over the place
Basically all configuration options are scattered among various places, some of the in the control center, some of them not (taskbar and panel). Counterintuitive and a serious regression from the previous KDE versions.
All the bugs that I found on this are in fact fixed in KDE 4.2.2, even the WONTFIX ones. If you can be very specific as to what you'd like to see improved, I'll do my best to make sure that it is.