Ready to answer your Kharkov '43 Questions...

[Volcano Man]

Has the dust settled? Can we come out from the fallout shelter and talk about the game now? ;)

Liebchen, to answer your question, I don't think this can be turned off in the game (at least I haven't see a method of doing that), but you might be able to adjust some sort of sensitivity of the mouse wheel in Windows control panel? I have done what you describe and zoomed the map by accident, until I made it a habit of taking my middle finger off the wheel.