For vim the answer is "hjkl"... don't you know them?
And for xterm you got left and right, so you can correct what you wrote, but not recover old command easily.

However they could also be useful for games and I think I will miss them a lot. I NEVER use the àèìòù because they don't belong to the strict ASCII standard and different text editors behave in different way (some display it correctly, others display '?', others rectangle, and so on). I prefer to write a',e',i',o',u'... not "italianally" correct, but strictly standard.