It would be good if will be themes for children and old people with big visible fonts and icons in both Ubuntu and Kubuntu.
If you add somehow most simplified panel and and menu view for most important things like web browsing and gaming, we will not need think how to configure it.
Ubuntu is linux for human beings, it means for everybody. None of linux distributions has this feature, let Ubuntu be the first who has it.
Addition: 1. Big cursor with big clicable area setting
2. Disabled keyboard repeating? When one presses a key, reaction might not be good to enter only one letter - it's not useful.
3. Big fonts, big icons and widow decorations.
( 4. A RADICAL idea: home directory set as the desktop - $DESKTOP=~ - all files of old man or child are on desktop, and there is no need to click on 'home' icon)