Zooming on Map

[Svenker]

Dear Subsimmers

I've got a little problem, recently I had to reduce myself to an very old mouse, which has no scroll wheel, so there I am unable to play the game because I can't set my route on the map since it is fully zoomed in, I've figured out where the control options are hidden in the game folder but haven't found out how to map the function 'M. Wheel' differently, has anyone any suggestions? As I'm kind of stuck right now

Thanks,

Sven