The following special keys, when used while also using your mouse or trackpad, modify how those gestures work. (These are in addition to systemwide macOS modifiers, such as holding Shift to make a vertical scroll wheel scroll horizontally.)

When starting to drag an event:

- Hold Option to make a copy of that event and drag the copy instead (see Duplicate and Drag)

While dragging an event:

- Hold Shift to allow the event to be placed anywhere, even if it’s a span event overlapping another span event (see Event Overlaps)
- Hold Shift+Option to force the event to create a new, empty row wherever you drag it, ensuring it remains on a row by itself
- Hold Command to prevent snapping to nearby time interval dividers (weeks, months, etc.), so you can always drag it to any allowed date

In other cases:

- Hold the space bar to pan; your mouse cursor turns into a hand, and you can click and drag to move the timeline around
- Hold Command and turn a vertical scroll wheel to scale your timeline up and down; this is equivalent to using the two-finger pinch/stretch gesture on a trackpad