Authpuppy modification - Doctrine Version

Guys,

My name is Willian and I'm quite new on Authpuppy/Symfony/Doctrine world. I have a few questions about it. Hope you don't laugh on my questions.

I have to make a few modifications on AuthPuppy, so I read about how Symfony works, however I'm not confident about my knowledge yet. More I read about it, more questions I have. Basically, I want to show the content of a new table in a view. It’s very simple using Symfony, but I’m not sure how to map this new table.

Question #1: What is the doctrine version used on Authpuppy development?
Question #2: Can I use a different doctrine version to modify Authpuppy?

 This is the actual situation:
  Package Version State
  DoctrineCommon 2.3.0 stable
  DoctrineDBAL 2.3.0 stable
  DoctrineORM 2.3.0 stable
  DoctrineSymfonyConsole 2.0.6 stable
  DoctrineSymfonyYaml 2.0.6 stable

Everything under Linux Mint 13 (Mate)

Question #3: I want to add a new table on Authpuppy's Database. Could I map this new table using doctrine console or I have to remap the entire database again?

That’s it!