I posted the idea so people could use the work around. And perhaps to inspire someone with a different perspective to see a real fix.
Scrolling gets blown out of proportion when I work on the library, because its the complicated bunch of things the display can do and so is involved in many of the tests in my test program (which is included with the download). In real code, I have no use for it. I knew about the bug for at least 2 weeks before I posted anything about it; I was pretty sure no one would find it in a short period of time; I wouldn't have found it except that I started putting together a thorough test procedure when I started working on the library, adding tests as I added features and found problems to demonstrate. Then before I post code I run 4 interfaces on 4 different shapes of LCDs, 2 interfaces on the 40x4.
That takes almost an hour but it leaves me pretty confident I've found everything I ever knew could be a problem.