CircleCI parameterized build example

circle.yml

machine:
  ruby:
    version: 2.2.3

dependencies:
  pre:
    - sudo pip install awscli
    # gets verion 1.15 instead of 1.13.4
    - sudo apt-get update; sudo apt-get install wget

database:
  override:
    - echo 'Skipping database'
test:
  override:
    - echo 'Skipping testing'

deployment:
  production:
    branch: master
    commands:
      - >
        if [ -n "${DEPLOY_STAGING_TO_PRODUCTION}" ]; then
          ./deploy_staging_to_production.sh
        else
          ./deploy_to_staging.sh;
        fi

I was to adopt this script but the major inconvenient of it is that when looking to your master history you don't know which feature are in the production and which aren't.
Do you have a solution for that?
Thanks.