I think that it would be easier to recreate your slider using a slider plugin (Meta Slider, Crelly Slider, etc.) in order to achieve what you want, because Sydney slider doesn’t have much options.
You can switch to slider plugin in Customize → Header area → Header type section (use Crelly Slider option for Crelly Slider plugin and Shortcode option for other plugins). Then you should add shortcode or Crelly Slider alias in Customize → Header area → Crelly Slider or Customize → Header area → Shortcode section respectively.
Please create a separate topic for each of your issues to keep forum in good order and make it easier to help you.
Kind Regards, Roman.