I totally agree with the sentiment here, that such contracts that lay claim to your IP that you develop on your own automatically belongs to the company. I hate that and I've actually rejected offers in the past because of that reason exactly. I also think that if you could get a high profile enough case with that as the focal point, you could probably have such a thing declared illegal, and then establish precedent that could be used to invalidate the whole, "we own you AND your thoughts" corporate thinking. Or so I hope :)