I've run into this a number of times. The worst cases are when the configuration is under the users' control. My catch phrase is: if you have a user controlle

I've run into this a number of times. The worst cases are when the configuration is under the users' control. My catch phrase is: if you have a user controlled configuration file, you don't have a single program, you have 2^N programs where N is the number of configurable items. '2' is larger when the settings aren't binary.