I'm sure there's an obvious answer: I want to create a slightly customized version of my RoR app. It involves minor tweaks to some routes, changes to some of the layouts, turning off devise's :registerable and other bits scattered around the source code.
I'd like to define a single variable or flag that I can use throughout the code to create the customized version. Whatever I use, it needs to be visible to models, controllers, views and tests.
What's the best practice for doing this? (As an aside, I *don't* want to create a git branch for this -- I'm still debugging things and it would become a PITA to port bugfixes among multiple branches).