What, like the ones it has had all along?
Building and publishing an extension for Visual Studio 2010 | The Visual Studio Blog
] - doesn;t work on Express edition:
Quote:Note – extensions will only work on the Integration Shell, Pro, Premium, and Ultimate. The extension won’t work in the Express Editions. If you want to build extensions for the Express Editions, you’re limited to toolbox controls, item templates, project templates, and custom start pages.
I suspect MS would indeed mind if you start hacking it's software - especially given the licence conditions you agreed to when you installed the (free) product.
Upgrade to VS2013 Community instead of exposing yourself to possible legal problems.