This addon adds to the gui-controls a reaction on the mouse wheel:
1) Scrolling of comboboxes.
2) Rotation of azimuth-controls (keys Ctrl and Alt do change step of rotation).
3) Incrementing and decrementing of numbers in text-edit-controls (keys Ctrl and Alt do change step of increment).
4) Moving of slider-controls (keys Ctrl and Alt do change step of incrementing).
5) Auto-switching the focus the mouse.
Install the addon, open the editor, press F1-F6, roll the mouse wheel over the controls