Keep an eye on the size of your plasma-desktop-appletsrc. If you do a lot of
copying, for instance, it will grow quite large. If that happens, back it up
and then edit - look for links to temporary files and containments that are
obviously concerned with copying jobs, and remove them.
Tread with care - only remove the things you are certain of. The bug is
known, and being dealt with. It's only ill-effect is to slow down the launch
of kde - so until that becomes a problem for you, you don't need to do
anything about it.
New to KDE4? - get help from http://userbase.kde.org
Just found a cool new feature? Add it to UserBase