This posting is older than 6 months and can contain outdated information.
Thanks for asking.
By default, the virtual mouse executes a short left click when
pressing the play button. To drag an item, however, you'll want the
left mouse button to stay pressed.
To achieve that, select the action "Hold left button" for a button of
your choosing at RB Preferences > Mapping > Virtual Mouse. Then, when
you use that button the first time, the left mouse button is pressed
and will stay pressed. When using that button the second time, the
left mouse button is released.
Best regards,
Felix Schwarz