Version: (using KDE KDE 3.4.0) Can you add a global shortcut (KDE wide hotkey) to show/hide the KMail main window ? JuK and other applications provide such global shortcuts and that's very pleasant to press Ctrl+Alt+Space to show the JuK window, play few seconds with it, and re-press the same Ctrl+Alt+Space to hide it. The shortcut provides in fact the same function as if we clicked the systray icon.
this feature can be not only for Kmail it should be possible to configure this for every application
[SOLVED] You may use shortcut por minimize every widnow... http://forum.kde.org/viewtopic.php?f=17&t=88145
Closing as fixed