An option to make the middle mouse wheel zoom in and out. Right now it just scrolls vertically but the MMW button drag can do that. As a note I’m not sure if it is just me but the drag pan is a little unstable and seems to want to keep going to the right.
Thanks
Did you try Ctrl + MMW 
MMW = Vertical Pan
Shift + MMW = Horizontal Pan
Yes I was aware of that thanks. I am just used to the mouse scroll zoom from other apps. Not a big deal.
If you want to scroll to zoom, then just move the mouse pointer to the text area(where 100% is written) and scroll.
oh thats helpful, thanks!
Please note that the MMW combos that I indicated are the standard used in most desktop applications:
Web browsers, GIMP, Inkscape, LibreOffice… (but Krita)
They have nothing “surprising”