thanks, TucknDar, EasyWindowDrag is near perfect.
i had just modified skrommel's MoveInactiveWin to use the middle mouse button but it still required a key hit to activate it.
EasyWindowDrag's combined left and middle mouse button click method works better for, i.e. no keyboard required and a crucial point is that it won't conflict with things like photoshop that use keyboard and mouse combos to draw on the screen.
(i've even got my middle mouse button set at the right of my mouse under my thumb so the EasyWindowDrag method feels like i'm actually grabbing hold of the window with my thumb and index finger - really makes me think that this is how mouse interaction should work all the time. very intuitive.)