Slideshows should be soon but the locking was something brought up a few times in the forum. It seems to be a wanted feature but not sure if it IS being worked on.
As for the different colors, whenever scroll based interactions become available, that should be easier to create. I found this on the Facebook group that seems allow something like this with some code:
https://www.facebook.com/groups/editorxcm/posts/2320328448105848/