support of bidirectional text?

Hi I am quite interested to edit Hebrew text with emacs/xemacs. For that I re awoke an old Hebrew.el program of the beginning of the nineties. However there the text is written and SAVED from the right-to-the-left, which is sometimes called visual method. However for Tex and other purposes the text should be saved from-the-left-to-the-right and only displayed from the right-to-the-left. Now, although I am not specially attracted by MULE, is seems at the moment that they are only active group working on multilingual support within emacs/xemacs. TAKAHASHI Naoto, of the MULE team told me that they, in order to include Hebrew support within MULE, need something like a support of right-to-left display. As I understand it this would keep the text, written from the left-to-the-right but displayed vice versa. Now it is supposed that GNUemacs 20.4 will have something like this, but it is not clear when it will be released. Is there some hope that recent versions of xemacs will have such type of support. Thanks Uwe Brauer