This appears to be the scariest topic relating to Symfony2, as after a week of searching and testing, I am still unable to find an answer to this.
In short, I am buildin
Multiple applications projects can be achieved by splitting your code in multiple Kernels.
You can then benefit:
I have described the whole process here: http://jolicode.com/blog/multiple-applications-with-symfony2 and you can find an example distribution here: https://github.com/damienalexandre/symfony-standard