URL replace its not clear! how o use and make this??

So i read your faq and as I can see all my strange french characters like éèà etc.. have to be replace or they will be encoded as %20 or somethig like this.

So in URL replace: if I put é=>e i'm getting a 404 error, so what you tell to do is to replace by something like é=>eee !! but my url will be a nonsense.. and totally useless!

how can I replace my strnae character by the defaut one iwthout getting a 404 error or without replacing it by 3 letters which meaning nothing at all ??

Is it possible? if not i can say that your component is really useless for all non english website and you should have say it before we pay for it...
Can I have a pretty soon answer and if I can't have a good configuration for my needs I want a refund..how to do that?