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bbfa235
(Get the code!)
A solution which does not let the user scroll with the thumb is inconsistent, damaging the feature as a whole, and possibly problematic for people with limited hardware, as in your suggested solution.
In my case, I prefer to use the thumb, so having that not "just work" wherever I see a scrollbar is confusing. Not only that, but I frequently work on a Thinkpad which has neither a scroll wheel nor a track pad to support "two finger scrolling".
Unless you have hard data to the contrary, and a policy which explicitly supports excluding a known portion of your users, I'd recommend against any justification which relies on people interacting with their computer in precisely the way you do. Otherwise you risk creating one of the thousand cuts which make an interface just too painful to use.