I'm starting to wonder if anyone's even bothering to read what I'm writing. You've pointed out yet another example of a project which does not require a postal form, supporting my position. Requiring a disclaimer for works for hire isn't even comparable.

Edit: now that I've had my morning cup of tea, I've properly read that link - SQLite doesn't even require any form of contributor agreement, so all you're pointing out is that they require a company to agree that work done on their time is free to be contributed by the employee. That isn't the same thing at all.