Yes the OAuth problem was noted some time ago in this thread and Nivanka ( who wrote the module ) has become very busy.
Uhm...How to integrate an OAuth php lib?
Is it possible to use this lib http://framework.zend.com/manual/en/zend.service.twitter.html?
If yes, how include into Silverstripe or use in a new Twitter Mod?
Is there a guide how use Zend class lib into Silverstripe?