My mouse is incredibly busted and my scroll wheel fires off 'scroll' events randomly. It's really bad for games like Dota 2.
How can I prevent the camera from zooming with the mouse wheel? I'd prefer to even disable zooming entirely.
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Open your console and use this command
This will disable the zoom entirely.
To open the console you need to rightclick your DotA2 in steam and go to properties-> set launch options. There you need to add -console and start DotA2.
If this resets every time you start DotA2:
Open your DotA 2 Folder (...\SteamApps\common\dota 2 beta\dota\cfg) and create a new file called autoexec.cfg. Insert the above command into this file. This will automatically apply above command each time you start DotA2