Microsoft does this kind of stuff all of the time. (Think SP2 for a recent example.) Now, I'm not saying 2 wrongs make a right, but I do think that future releases can change fundamental features of how the program operates. This gives the end user the ability to upgrade at his own pace\discretion. I would expect though that the major revision number goto v5.x. Change is inevitable. [Jim steps down from his soap box.]

That said, I like the registry hack idea and I think that most would welcome such an easy solution.
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-Jim

...the sort of general malaise that only the genius possess and the insane lament.