Hi Malanis,
Roni here, from the Editor X Product team.
At the moment, fully customizable slideshows are not supported in Editor X. For now, if you auto-sliding is what you are after, you can use the Pro Gallery to get the effect you are looking for, with more structured layouts and designs. If customization is more important than the auto sliding effect, you can use the Slider display of the Repeater or the Layouter to create beautiful, fully customizable scrolling sliders.
A full solution for slideshows is indeed in our plans for the future.
Stay tuned for updates 
Best regards,
Roni