You could try an AutoHotkey script.
If you have AutoHotkey installed on your (Windows) computer, try THIS.
If you don't have AutoHotkey installed on your (Windows) computer, try THIS.
After downloading either file, double click it to run it, then an AutoHotkey icon should appear in your system tray.
The script sends a scroll up event every time you scroll down and vice versa, so it cancels out the scrolling in the game.
The script only works when the WGT Unity (PCEA) game is running.
When the script is running there are two shortcuts :
The PAGEDOWN key (toggle): Enables and disables mousewheel scrolling in the game. The AHK icon in your system tray will show an 'S' when scrolling is enabled, otherwise it will show an 'H'.
Control + Shift + x : Exits out of the script.
The only bug (I'm aware of) in the script is, if you scroll over an inactive window (i.e., one you haven't clicked on) the scroll will work in reverse. To prevent this, click on the window before attempting to scroll.