Customizing the "surround with" feature, e.g. "describe do ... end" Follow

Hi,

The surround with feature is great.  I'd like to add my own cases for that.  How can I do that?

The concrete example is that I'm often when I'm refactoring rspecs I find myself inserting new "describe" cases.

It would be great to have a surround with option for "describe do ... end", or better a mechanism to add my own templates, just like the live template customization.

Thanks,

Wolf