in the navigation panel I can choose the zoom mode (zoom by dragging the mouse)
can this be set as the default behaviour? I don't want to have to change it every time.
No, this cannot be set as default.
You can always use shift+mouse to zoom. But yeah, it would be nice to for example invert itp. Zooming only with mouse and croping with shift.
thanks a lot for your answers! I wasn't aware of shift+mouse, that solves my problem!