My daily Miro workflow involves using a mouse, and almost never using a trackpad.
When in Mouse navigation mode in Miro, my mouse wheel will zoom in and out on the board vs. scrolling up and down (or side to side when holding the Shift key) while in Trackpad mode.
While zooming via the wheel is my preference, there are occasions where I would prefer to scroll up down – my most recent example is when viewing Docs.
The Ask
When in Mouse mode, Ctrl + wheel would result in scrolling up and down (and Ctrl + Shift + wheel would scroll left and right).
