I know absolutely nothing about Selenium myself. It was added to svn by Dean Brettle when he was working on NeatHtml. He's not very active in the project these days but he comes by for a visit now and then so maybe he will respond to this post.
Feel free to upgrade it in your sandbox. And if you find it useful and would like to document how to use it in regards to mojoPortal let me know and I'll create a page that you can edit in the documentation section.