DEs should have a restore ALL to default or LAST working settings I have installed gnome and kde and unity on my ubuntu... and quite some time, when i have changed some settings in it, i oftentimes stumble upon things that break it or not to my liking, but going to default means messing with config files etc... or going to each settings which i may already have forgotten anyway.. 

Should there be a ONE "restore ALL to default settings" button anywhere in those DEs? just thinking about though... 