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[eluser]Harold Villacorte[/eluser]
Mostly I just follow convention and leave the routings as they are. But there are some urls that just have to rerouted like 'about', 'contact', etc. unless you want to write a controller for each one. The documentation states:

"In some instances, however, you may want to remap this relationship so that a different class/function can be called instead of the one corresponding to the URL."

Further, the tutorial in the documentation also teaches you how to write custom routings. It is one of the first things you learn so you are expected to use it.

So to finally answer your question: Yes and Yes. I do configure the routings and I do follow CI rules.