Y'know ... that's one thing I'm real surprised they didn't think of - the left-hand scrollbar. Being right-handed myself I guess it just never occurred to me - but I can think what a headache it might be to have the mouse on the left-hand-side of the monitor and the scroll-bar on the left so I guess for left-handers it's equally a pain to deal with the right-hand scrolling region. Same situation with paper notebooks. They haven't fixed those, either, come to think of it.
Correcting that, however, would not be a simple process. You're talking about digging apart the basic classes that make up all window objects. The utility would have to subclass ALL windows and change the way in which they are painted and how they respond to mouse events - and this would affect all applications. You're talking about an O/S-level hack here not just a "nice little program" that could be thrown together. If Microsoft didn't develop the Windows classes with this in mind you're going to find it mighty difficult to make it work consistently, if at all - because you're going to have to do it below the applications layer altogether.
Implementation of a left-hand scrollbar could work on an individual application (using a custom-control) but I think you're talking about modifying the system so ALL applications work that way - right? Big project.
You're going to have to put together a lot more than a "bit of money" in order to produce these kinds of things. What do you think this is, anyway, Linux?
-CB