Hoi, I have spend a little bit of time getting the characters in order for the Gujarati and the Sinhala language. I have asked one of the Usability Initiative developers if he could enter them in the "advanced toolbar". He did, and he asked me to verify the result..
If you want YOUR script to be supported in the same way, please provide us with all the characters for your script in the standard sorting order. This is one way in which you can help your language. The other is to localise the messages that come with the Usability Initiative software. The idea is to make MediaWiki better usable and this helps. When you localise at http://translatewiki.net, you will find that the results are typically there the next day.