Add ability to customize theme based on conditions

Specific use case:

I work in a PHP code base that requires the code be built in order to be used (I know how odd this sounds, but this is not really the topic of this request) and, at the moment, I develop in one ST2 instance while I inspect/debug in a second ST2 instance. This works really well except for cases when I begin to develop in the instance that is built out because I am not paying attention to the file paths in the title bar. While it is helpful being able to look at the title bar to see where I am, what would be incredibly sick is to tell ST "If the root of the project I am in right now is /path/to/working/code then use theme 'ABC', if the root of the project I am in right now is /path/to/built/code then use theme 'XYZ' otherwise use theme 'default'".

I honestly don't know if this can be done or if this even has value to anyone else. But it sure would be a lifesaver for me to be able to have two different looking instances of ST as I develop/debug so that I don't make the mistake of developing in a built segment of code when I should not have been.