u,e,o,a becomes ü,éè,ö,à when sliding down.
Also different keyboard layouts would be cool, like qwertzu, azerty,... Always with the important keys for each language bigger. On a german layout there woud be ü,ö more important, on a french layout éè, û and so on.
I would love to be able to type in spanish!!
Very important for the non-english speakers!