When inserting note events, you can modify specific note values on the fly.
To edit the note velocity, drag upwards or downwards.
To edit the note pitch, hold down Alt/Opt, and drag upwards or downwards.
To edit the note length, drag to the left or to the right.
To edit the time position, hold down Shift, and drag to the left or to the right.
Note
You can activate/deactivate Snap temporarily by holding down Ctrl/Cmd.