Version: (using KDE KDE 3.97.0) Installed from: SuSE RPMs Typical situation, you add widget, oh, not that one, the one below, ok, minimize dialog, find widget, remove it, back to the dialog... Time consuming. Simple button "remove widget" would do the trick.
PS. Sorry, wrong selection -- it is about plasma "add widget", not kickoff.
:-( To miss such feature...
click on the red x beside the star icon in the dialog. That removes all widgets of that type. It's been in SVN for quite some time now.
Thanks Ryan, as you see in #2 comment I had to be blind for a moment to miss it.