Originally Posted by Stephen
I realise it does not help solve your problem but it seems to zoom by default using the scroll wheel, no setting up required. I had a look around and couldn't see a command that would help you. Is there anything in the CP that would help
After I'd replied to Ash, describing my own method (Alt+ wheel) I did a quick search and came across a thread HERE
with other methods for both PCs and Macs.
It includes the obvious (which is the one place I almost always
forget to look) and that would be to go to 'Preferences/General' - then tick the box to allow zoom with the mouse.