It's a reminder, the editor really needs better usability with the mouse.
Middle mouse button scrolling is used to zoom , it's good.
While are missing:
- Middle mouse + SHIFT = strafe
- Middle mouse + ALT = rotation
I don't like the editing working like it was a game (keys to move and keys to strafe, shift to run ), it's not good.
At least this should be configurable in editor properties about speed movement, speed strafe and key bindings.