good question
yeah,it'll be more difficult for us if the title is in japanese,i cant understand it and even cant read it
and of course the feeling would be different.
but for Ayu, when i'm talking with my japanese friend,which is a fan of Ayu too,she said that Avex do that for her song because they had expected from the beginning that she would be popular outside Japan too.well, that's what she said to me