Open up the Language Infrastructure
There are so many requests for adding language x or language y. I started two of them requesting support for IronRuby/ IronPython
There are request for hosting Powershell, adding Delphi/Prism.
Why not add IronJS, Phalanger (for PHP), Nemerle, IronScheme or any other language.
How about switching the editor to the AvalonEdit of SharpDevelop for creating your own syntax highlighting and Code Completion.
A good way to kill 4 or more bird with one stone.