a further 2 issues on N900:
1.: there's no way to get back from the settings-screen to the clock-screen. I have to close flipclock via task-manager and restart it.
2.: insomniac mode is working reasonably: after enabling insomniac mode, the display stays turned on but the brightness won't change. unfortunately the insomniac mode is system-wide. even when flipclock is completely closed, the display won't turn off anymore. workaround: you have to go to the system-screen-settings again and set the period of time to lock the screen. however you start (and close) flipclock the next time, this workaround has to be repeated.