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In principle I think it is possible, but it is not recommended.
Those icons are integrated into the scroll bars.
Making scroll bars bigger is stealing precious space from the rest of the application.

Qtractor should be able to include mouse events in keyboard shortcuts.
In my case I would configure it as:
[Ctrl]+CenterMouseScrol= Horizontal Zoom
[Ctrl]+[Shift]CenterMouseScrol= Vertical Zoom
[Ctrl]+[Alt]CenterMouseScrol= Full Zoom

This would also allow zoom's behavior to be homogeneous in the sequencer and the MIDI editor.
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Other behavior I would find intuitive related to zoom:
- In the sequencer zoom in and out track [Ctrl]+CenterMouseScrol
(It would work to add to the current [Ctrl]+[+/-] without having to release your hands from the mouse)

- In the midi editor [Ctrl]+CenterMouseScrol on the keyboard = [Ctrl]+CenterMouseScrol= Vertical zoom

Both the track area and the piano have a vertical layout and only vertical zoom makes sense, so simply [Ctrl] and not [Ctrl]+[Shift].