Currently OpenOffice tries to enforce focus for some dialogs by sending a _NET_ACTIVE_WINDOW client message when the main window gets is focused, while a 'modal' dialog like options or printer settings is open, to make the window manager set focus on the dialog again. This conflicts with focus follows mouse and can lead to really disturbing behavior when the window manager slides the pointer to the window that is activated by _NET_ACTIVE_WINDOW. I think the right way to do it would be to set these dialogs net_wm_state to be modal and their icccm transient_for to the main window. this way the wm should know that it does not set input focus on the main window while modal dialog is open in the first place. See native gtk file open dialog for example which does it like this.