Writing hacks and throw-away stopgap solutions is generally a bad idea in reality. The only time when it can actually be allowed is when it it concerns a featur

Writing hacks and throw-away stopgap solutions is generally a bad idea in reality. The only time when it can actually be allowed is when it it concerns a feature that is a pure leaf in the system with nothing else built on top of it. I worked at a company where there was an API and an explicit place for such hack code, for consultants to customize the product. The way it was done, was to ensure such code was a pure leaf.