This is indeed a good strategy, but beware: designing, implementing and documenting a good plugin or extension mechanism is quite some work itself. If it makes

This is indeed a good strategy, but beware: designing, implementing and documenting a good plugin or extension mechanism is quite some work itself. If it makes sense for your project to have such a thing, sure, go for it. If it's just a way for you to avoid having to say no... learn to say no instead. :-)