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Is there a way to change the modifier key for the mouse wheel zoom in smaller increments?

I'd like to change it from Ctrl to Shift because I mostly use other software that works this way so I always hit the wrong modifier in QGIS and can't get used to it.

I looked in the Keyboard Shortcuts, but didn't find it. This menu seems to be only for keyboard shortcuts, not mouse interaction.

  • If this option exists, it would be in the Keyboard Shortcuts window (accessed through the Settings menu). – csk Jul 8 at 17:41
  • I looked there first but didn't find it. This menu seems to be only for keyboard shortcuts, not mouse interaction. – Gamnamno Jul 9 at 18:31
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I did a bit more digging, and as far as I can tell it's not an option to change this setting. Details below:

  • "Fine-resolution mouse wheel zooming" was a new feature in version 3.0. That's fairly recent. Newer features tend to have fewer customization options than old, well-established options.
  • The user manual describes using the Ctrl key for fine resolution mouse wheel zooming. There's no mention of any possibility of changing the key.
  • As you mentioned, fine zoom control is not listed in the Keyboard Shortcuts settings window. That's the logical place where you would go to change a combined keyboard/mouse button shortcut.
  • It's not mentioned in Options > Map Tools, where you can set a "zoom factor" percentage.

    enter image description here

    • It doesn't show up in the Advanced Settings Editor when searching for "zoom."

    enter image description here

At this point, I feel reasonably confident in saying that there's no option to change the modifier key for fine zoom using the mouse wheel. It's probably a hard-coded key setting. In theory you could modify the source code, but unless you really know what you're doing that's not a reasonable option.

Your remaining option is to make a feature request. Before making a feature request, it's always a good idea to search for similar feature requests, in case the developers have already considered and decided against implementing the feature you want. For example, see the discussion and reasons that the feature request "Usage of the mouse scroll wheel" was rejected.

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