I have downloaded the free version and will have a look to add its definition in a next release of JMS 1.2.94 and JMS 1.3.0 beta 3
For your information, in JMS 1.3.0 medium edition, there are new functionalities to detect the browser features such as the "accepted language".
So that, with the new "Set new default" functionality present in JMS 1.3.0, it is possible to automatically redirect a user on the appropriate language variant of the website.
See the JMS 1.3.0 variants
www.jms2win.com/multisite13variants