Visual Studio 2012自定义待定更改窗口

I'd like to create a checkin policy for Visual Studio 2012. It should be possible for developers to ignore the policy violation (yes, I have a use case for this) by some checkbox or something. For this I need to adjust the Pending Changes Window (adding the checkbox and maybe some text). Do some of you know if and how this can be done? Or some other possibility to achieve this goal?I'd like to create a checkin policy for Visual