Thoughtbot Dotfiles on Linux

Thoughtdot Dotfiles are great, I saw first these files which work very smooth and all functionality is great. But is there any reference about how a ruby on rails developer can use them effectively, as there are lot things in it, and someone who does not know much about Vim can be confused and start to adding many more commands in .local files, and I noticed sometime such functionality already exists, as I really don’t want to add more plugins but want to make sure to use all already present plugin use effectively. So it would be great if you suggest any reference how you guys use vim as a ruby on rails developer, and key board short cut for running rspec?