I think that it is time to really get rid of it I have two more demos that I have been playing with that work when MOUSE_HACK is not defined. Dominions II (1a) and Starlancer (2a). starlancer thinks it is running in a 640X400 window an the program itself is setting the cursor at x=320 and y=200 and dinput trys to put it at x=320 and y=240.
I think you are over-reacting here... Your problem is not related at all to MOUSE_HACK (see my next message) but to the general 'mouse warping' problem.
At least I thought I explained it well in the bug report but it seems that it was not the case...
Does anyone know of a game that game that needs it? IE: does not work without it defined?
Well, take all FPS shooters and you will have a nice list :-)
Lionel