Version: 1.9.1 (using KDE KDE 3.5.1)
Installed from: SuSE RPMs
I don't know if it was intention, but removing the 'delete message' button from the toolbar causes that the shortcut for deleting the message doesn't work. Placing the button back return that functionality back. I tried to remove other buttons without problem.
Reports about keyboard shortcuts being lost:
Works for me in KDE 4.3