Default Rails setup convention between "bundle install" and "rake"

[Al]

Question: Has anyone thought about or worked on creating default Rails
setup code for the work between "bundle install" and "rake" for Rails
4.0?

-- Sub-question: Is it part of Rails or rake or joint effort?

-- My initial guess at what should be included:
-a- Naming convention for hidden and multiple database.yml
files.
-- template: database.<one_word>.yml
-- if only one hidden file, then
-- database.example.yml
-- if one hidden file per database type, then
-- use gem name as <one_word>
-- database.sqlite3.yml, database.postgresql.yml,
-- database.mysql2.yml, database.oracle.yml
-b- A rake command that exercise the typical steps between
"bundle install" and "rake".
-- Mostly, but not completely, involving database setup.
-- Examples from existing projects:
-- rake db:setup, rake setup, lots of rake
db:<one_step>
-- Can you run this default rake command completely in
batch mode?

Thanks,
Al

PS. What is the right "rake" e-group to ask this question?