I think we have to rely on Drupal and the individual translators to provide bidirectional support. Mostly because none of us know anything about it. I know that Drupal uses Unicode, and it has special characters to designate the direction of text, so it should be as simple as providing proper translation strings. You'll have to do some research to find out for sure. People on groups.drupal.org may be the most knowledgeable about this topic.

Whenever someone provides a complete Ãœbercart translation, we'll be happy to include it in the downloads. Of course, a complete translation is dependent on the stability of the source strings. Translators are certainly welcome to start their work at any time, but they should be alert to changes between releases.