using sass to generate RTL & LTR css files in Omega 4 is there any convenient way of using Omega 4 to compile rtl and ltr css files automatically. I mean something like this or this, but for drupal.
I guess it depends on what you define as being convenient.

The SASS part is easy, since sass support is already setup in Omega. You just need to setup some sort of a sass structure to write the CSS.

To change the language settings, you'll want to invoke the template_preprocess_html() function to override the html that's rendered.
function template_preprocess_html