sPlan is developed for computers with a mouse that has two buttons and a scroll wheel. On a Mac the two-finger scroll using the trackpad mimics the scroll wheel, which results in very rapid zoom-in / zoom-out. This happens on the built-in trackpad of Macbooks as well as on external Apple trackpads.
I have found no way to map two-finger trackpad movements to scrolling in sPlan. However, it is possible to slow down the zoom-in / zoom-out to a reasonable speed.
To fix this, you must change a registry setting:
In your bottle choose Run Command, and enter regedit as the program to run.
In the Registry Editor navigate to HKEY_CURRENT_USER\Software\Wine. This key should already exist.
Under that key add a new key called Mac Driver.
Inside this new key add a new String Value called UsePreciseScrolling and sets its value to n (just that single letter).
This still won't allow you to use two-finger scrolling, but at least prevents extreme zoom and repaint actions by sPlan.
Note: I use 64-bit Windows 10 for the bottle.
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