Redmine

Hello Everyone

I'm not a Redmine user. Studying it for research purpose. Please answer the following questions.

1. Is there any plug-in available for tracking software development process in Redmine?
2. According to a developer's point of view, how important it is to have a complete set of project related documents and artifacts in a single repository?
3. Development processes are not very evident or artifacts are not well managed for future and current use. To which extent these lines are true?

Kindly reply :)