zoom in/out a little bit

this is a tip for tune GIMP to zoom without the CTRL modif.
How to tune GIMP for a small zoom values, not for zoom jumps like in default settings?
Also: if i set event like this then scrolling up have a small values. How to set a more values like a scroll the wheel with pressed SHIFT? With pressed SHIFT - the scrolling is jumping.
Main purpose:

  • scroll wheel without modifs: view zoom in/out with jumps (big values) (decided)
  • scroll wheel with CTRL: view zoom in/out a little bit (small values)
  • scroll wheel with ALT: scroll up/down with jumps (big values)
  • (scroll wheel with SHIFT witout changes)

thank you